Main Diseases of Zucchini and Their Prevention and Control Methods

This paper elaborates the symptom characteristics and control methods of virus diseases including squash leaf curl china virus(SLCCNV),watermelon mosaic virus(WMV),cucurbit chlorotic yellows virus(CCYV),cucumber mosaic virus(CMV)and zucchini yellow mosaic virus(ZYMV),as well as fungal diseases including zucchini powdery mildew,zucchini downy mildew and zucchini scab that harm zucchini production,in order to provide a theoretical basis and technical support for disease prevention and control of zucchini.

Selection of Greenhouse Zucchini Varieties and High-Quality,High-Yield and High-Efficiency Cultivation Techniques

[Objectives]To select zucchini varieties suitable for cultivation in Zibo City and test its high-yield cultivation techniques.[Methods]Six zucchini varieties were introduced,and their commercial quality and yield were determined.[Results]The yield of Shengfeier,Xiuyu 170 and Xihulu 309 increased by 11.4%,6.9%and 4.6%,respectively compared with S68(control),and zucchini was straight,looked pleasing to the eye,and had strong disease resistance.[Conclusions]The zucchini varieties were selected and the high-quality,high-yield and high-efficiency cultivation techniques were integrated.

Development and detection application of monoclonal antibodies against Zucchini yellow mosaic virus

Aphid-borne Zucchini yellow mosaic virus （ZYMV） is one of the most economically important viruses of cucurbitaceous plants. To survey and control this virus, it is necessary to develop an efficient detection technique. Using purified ZYMV virion and the conventional hybridoma technology, three hybridoma cell lines （16A11, 5A7 and 3B8） secreting monoclonal antibodies （MAbs） against ZYMV Zhejiang isolate were obtained. The working titers of the ascitic fluids secreted by the three hybridoma cell lines were up to 10^-7 by indirect enzyme-linked immunosorbent assay （ELISA）. All MAbs were isotyped as IgG1, kappa light chain. Western blot analysis indicated that the MAb 3B8 could specifically react with the coat protein of ZYMV while MAbs 5A7 and 16A11 reacted strongly with a protein of approximately 51 kDa from the ZYMV-infected leaf tissues. According to this molecular weight, we consider this reactive protein As likely to be the HC-Pro protein. Using these three MAbs, we have now developed five detection assays, i.e., antigen-coated-plate ELISA （ACP-ELISA）, dot-ELISA, tissue blot-ELISA, double-antibody sandwich ELISA （DAS-ELISA）, and immunocapture-RT-PCR （IC-RT-PCR）, for the sensitive, specific, and easy detection of ZYMV. The sensitivity test revealed that ZYMV could be readily detected respectively by ACP-ELISA, dot-ELISA, DAS-ELISA and IC-RT-PCR in 1：163840, 1：2560, 1：327680 and 1：1 310720 （w/v, g mL-1） diluted crude extracts from the ZYMV-infected plants. We demonstrated in this study that the dot-ELISA could also be used to detect ZYMV in individual viruliferous aphids. A total of 275 cucurbitaceous plant samples collected from the Zhejiang, Jiangsu, Shandong and Hainan provinces, China, were screened for the presence of ZYMV with the described assays. Our results showed that 163 of the 275 samples （59%） were infected with ZYMV. This finding indicates that ZYMV As now widely present in cucurbitaceous crops in China. RT-PCR followed by DNA sequencing and sequence analyses confirmed the accuracy of the five assays. We consider that these detection assays can significantly benefit the control of ZYMV in China.

Markers for Rapid Evaluation of Virus Resistance for TYLCV in Tomato, ZYMV and PRSV-W in Zucchini and LMV in Lettuce and Hybrid Seeds in Pumpkin

Screening for the source of virus resistance in horticultural plants or specific characterization as hybridization, through symptoms, requires time and depends on the weather and knowledge of plant characteristics. So, it is important to develop specific gene markers to allow rapid diagnosis by PCR. Markers were developed based on sequences homology comparison of susceptible and resistant plants provided by HORTEC SEEDS in tomato for Tomato yellow leaf curl virus (TYLCV) by the resistance gene Ty-1, in zucchini for Zucchini yellow mosaic virus (ZYMV) and Papaya ringspot virus estirpe watermelon (PRSV-W), and in lettuce for Lettuce mosaic virus (LMV). Fragments of 249 bp were amplified only by resistant plants to TYLCV as the hybrids 2648 and Aguamiel, and not for varieties as Santa Cruz or Carina. It were observed for ZYMV the amplification of 791 bp by the resistant hybrid Px7051 and not for the susceptible cultivar La Belle;for PRSV-W using the same zucchini plants the amplification of 650 bp for susceptible and 750 bp for resistant;for LMV the 421 bp amplification only for the resistant cultivar Brasil 303 and not for susceptible Babá de Verão. Finally, it was observed that primers PK47F/R were able to check the Cabotiá seed hybrids of pumpkin Jabras.

Required amounts of medium and fertilizer for potted culture of zucchini

In Japan, zucchini culture has yet to get underway, and the current costs of zucchini can be attributed to damage from soil-borne disease and the unstable yields due to seasonal change of female flowers. Eradication of these problems will lead to stable supply and a consequent price reduction of zucchini fruits. We previously clarified the efficacy of potted culture as a new culture method for zucchini, but potted culture can be burdensome as the weak water and nutrient retention capacity of the medium warrants its regular replacement. To solve this problem, in this study, we investigated the blend ratio for mixing rice husk charcoal with peat and the amount of fertilizer required for potted culture of zucchini. Results revealed no significant differences in the length of the largest leaf, total number of flowers, number of female flowers, and the ratio of female flowers to total flowers with different blend ratios of rice husk charcoal to peat. However, the number of harvested fruits increased with higher ratios of rice husk charcoal to peat and was highest at 80:20. The length of the largest leaf increased with increased amounts of fertilizer, with the best response was at 200 g. No significant differences were noted between the ratio of female flowers to total flowers in any treatments. In addition, the number of harvested fruits was highest with 160 g and 200 g of fertilizer. Taken together, the optimal blend ratio of rice husk charcoal to peat is 80:20, and the optimal amount of fertilizer with this ratio is 160 g.

Isolation and Identification of Squash Leaf Curl China Virus in Zucchini

[Objectives]In 2019,virus diseases occurred widely on zucchini planted in Shandong Province.The disease symptom was different from previous reports.This study aimed to identify the pathogen causing the zucchini virus disease.[Methods]Ten diseased zucchini leaves were collected in the field and used as materials for PCR and sequencing.[Results]PCR detection and sequencing showed that the nucleotide sequence of the amplified fragment had the highest identity with the squash isolate of squash leaf curl China virus(SLCCNV)(MW389919.1)in Guangdong Province.Primers were further designed for amplifying the full-length SLCCNV.The full-length DNA-A was 2730 bp(OM692270.1),and the full-length DNA-B was 2711 bp(OM692269.1).Through sequence alignment,it was found that the DNA-A sequence shared identity of 89.65%-99.42%with registered SLCCNV,and the identity with the SLCCNV-GDHY pumpkin isolate(MW389919.1)in Guangdong was the highest,at 99.42%.The DNA-B sequence was identical with registered SLCCNV in the range of 81.82%-97.29%,and the identity with the SLCCNV-GDHY pumpkin isolate(MW389918.1)in Guangdong,was the highest,at 97.29%.Therefore,it was speculated that SLCCNV is the pathogen of zucchini virus disease.Since the virus was first found on zucchini in Shandong,it was named SLCCNV-SD.[Conclusions]This study provides materials for the research on the spread of SLCCNV in China and the analysis of population genetic characteristics,as well as a reference for the prevention and control of the virus in zucchini.

Study the Effect of Different Levels of Zucchini (<i>Cucurbita pepo</i>L.) on the Biological Indicators for the Prevention of Cardiovascular Disease in Rats Fed High-Fat Diets

The effects of fresh zucchini on nutritional status, and biological indicators for the prevention of cardiovascular disease in rats fed high-fat diets investigated in this study. Thirty Sprague Dawley rats were randomly divided into two main groups the first, negative control group Co (-) (n = 6), fed basal diet, The second group (n = 24) fed high-fat diet (containing basal diet + 5% tallow + 1% cholesterol + 0.02% bile salt). This group was divided into four subgroups each group 6 rats: group positive control co (+) fed high-fat diet only, group 1 (G (1)) fed high-fat diet plus 10% zucchini, group 2 (G (2) fed high-fat diet plus 15% zucchini and group 3 (G (3)) fed high-fat diet plus 20% zucchini. The levels of serum total cholesterol (TC), triglyceride (TG), high-density lipoprotein cholesterol (HDL-C) and low-density lipoprotein cholesterol (LDL-C) were measured after eight wk. of experimental treatment. The pathologic changes of the heart, spleen and kidney were evaluated. SPSS, one way ANOVA was used to analyze the results. The results indicated that the mean values of body weight gain (BWG) and feed efficiency ratio (FIR) in G (2) and G (3) showed significant decrease compared to co (-), co (+) and G 1. The results showed that in groups (G1, G2 and G3) the relative weight of heart had significant increase when compared with control negative group. But liver and spleen weight had no significant difference when compared with control negative and positive group, the levels of TC, TG and LDL-C were significantly increased in co (+) (P < 0.05) Compared to co (-), all groups fed on high fat diet containing different levels of zucchini (10%, 15% and 20%) had significant decrease in TC and LDL-C compared with co (+), also G2 and G3 had improve significant in HDL-C when compared with co. (+). The groups fed on zucchini give results similar to group co. (-). The best treatment was zucchini (15% and 20%) which had lowest values of total lipid cholesterol and LDL-C, and the best values of HDL-C, HDL-C/TC % for all groups fed on high fat diet and zucchini increased non significantly (p ≤ 0.05) the HDL-C/TC % index compared to group co. (+). while, G2 and G3 gave significant decrease in LDL-C/HDL-C ratio compared to group co. (+). Morphologic changes of heart, spleen and kidney revealed that groups G2 and G3 had a similar preventive effect against CHD in this experimental model. In conclusion, results showed that zucchini had similar potential to attenuate CHD-related parameters in a mild oxidative stress induced by high-fat diet in rats.

Direct Organogenesis from Cotyledonary Node Explants of Cucurbita pepo (L.)—An Important Zucchini Type Vegetable Crop

Cotyledonary node explants from 3 - 5-d-old seedling derived explants of Cucurbita pepo (L.) produced multiple shoots in Murashige and Skoog (MS) salts B5 vitamins containing medium in the presence of N6-benzylamino-purine BAP 1 mg/L + Thidiazuron TDZ 0.05 mg/L. After 4 weeks explants were subcultured to medium containing MS salts B5 Vitamins BAP 0.5 mg/L, Gibberellic acid GA3 1 mg/L and L-Glutamine 15 mg/L. Periodic excision of regenerated shoots from the explants increased shoot efficiency during subculture. The combination of L-Glutamine with BA and GA3 significantly increased the shoot proliferation. Elongated shoots were excised from shoot clumps and transferred to rooting medium containing indole-3-butyric acid (IBA, 1.0 mg/L). The rooted plants were hardened in small pot containing standardized garden soil, well developed plant transferred to greenhouse and survival rate was 85%.

Efficacy of the Pepper Extracts to Control Zucchini Yellow Mosaic Virus

The Zucchini yellow mosaic virus （ZYMV） （Potyvirus） on “zucchini” presents great economic importance for Malagasy farmers. Numerous aphid species （Hemiptera： Aphididae） spread viral particles, which are easily transmitted mechanically, too. Farmers ignored this disease, therefore, its control became extremely difficult with insecticides. This study aimed to evaluate efficacy of chili pepper extracts. Treatments vary as a function of its initiations and were repeated at weekly intervals until harvest. It was conducted in market gardens around the town of Antananarivo. The study compared four treatments and repeated three times： firstly, plots received a protection as soon as installation of culture （preventive protection）; secondly, plots received treatment with low infestation （about a quarter plants infested） （late protection）; thirdly, plots received treatment with high infestation （about half of plants infested） （latest protection）; lastly, plots without treatment （the control）. As a result, pepper extracts can provide a significant level to control against aphids attack, and permit to delay virus installation on plots, which received treatment as soon as implementation of culture. However, it cannot eradicate and cannot limit extend of virus disease on plots already infested. Economic analysis shows that preventive treatment of pepper extracts to fight virus attack provides an even greater return on its investment than all other terms. Thus, use of pepper extracts can reduce chemical treatment and pollution.

Substrate Type Affects Growth, Yield and Mineral Composition of Cucumber and Zucchini Squash

The expansion of hydroponics in many countries of the world in the last few decades may be ascribed to the ability of soilless growing systems to avoid various problems arising from the use of the soil. Cucumber （Cucurnis sativus L.） and zucchini （Cucurbita pepo L.） plants were grown in closed-soilless culture under unheated-greenhouse conditions at the experimental farm of University of Tuscia, Central Italy to evaluate the effects of four substrates （rockwool, pumice, perlite, and cocofiber） on growth, yield and plant mineral composition. For both cultures, plants grown in cocofiber, perlite and pumice yielded more than those grown in rockwool. The better temperature regime in cocofiber, perlite and pumice was due to the greater thermal inertia compared to rockwool slabs. Thc concentration of N in zucchini and cucumber leaves was significantly higher in cocofiber, perlite and pumice in comparison to the rockwool treatment. The concentration of K was significantly affected by the substrate only for the zucchini squash with the highest value recorded on the organic substrate （cocofiber）, whereas the Ca concentration was significantly influenced by the growing media only for cucumber with the highest value observed on pumice. Finally, the lowest Mg concentration in leaf tissue was observed on plants grown with the rockwool substrate for both zucchini squash and cucumber. We can conclude that cocofiber, perlite and pumice are suitable for zucchini and cucumber production in closed soilless system, whereas the use of rockwool is more suitable for crops grown under heated greenhouse conditions.

干旱低温复合胁迫下黄腐酸钾对西葫芦幼苗生长和生理生化特性的影响

本试验以西葫芦‘农园1号’为材料,设置7个处理,分别是对照(CK,无干旱低温胁迫且不浇灌黄腐酸钾)、DL(干旱低温胁迫下不浇灌黄腐酸钾)和T1、T2、T3、T4、T5(干旱低温胁迫下黄腐酸钾浇灌浓度分别为0.020%、0.035%、0.05%、0.065%、0.08%),研究干旱低温胁迫下黄腐酸钾对西葫芦幼苗生长和生理生化特性的影响。结果表明:干旱低温胁迫下西葫芦幼苗的干鲜重、脯氨酸含量和SOD、POD、CAT活性以及光合能力均受到抑制,不同浓度黄腐酸钾处理均可缓解干旱低温对西葫芦幼苗生长和生理生化指标的抑制作用。其中T3处理效果最佳,其幼苗叶面积、全株鲜重、全株干重、脯氨酸含量和SOD、POD、CAT活性与DL相比分别显著增加13.89%、16.20%、17.43%、19.43%和13.48%、7.13%、16.28%,MDA含量降低14.37%,叶绿素总量、净光合速率显著增加19.66%和17.95%,叶片的Fv/Fm、ΦPSⅡ、ETR、qP显著升高4.25%、17.57%、14.85%和14.01%,Fo、NPQ分别降低5.30%、15.79%,即减轻了干旱低温胁迫对叶片光合器官的损伤。综上看出,黄腐酸钾可以在一定程度上缓解干旱低温胁迫对西葫芦幼苗生长和生理生化指标的抑制作用,以0.05%黄腐酸钾处理(T3)效果较为显著。

南亚果实蝇对不同品种西葫芦的产卵选择及生长适应性

为明确南亚果实蝇Zeugodacus tau对不同品种西葫芦的产卵选择及生长适应性,以便为西葫芦上南亚果实蝇的防治提供参考,本研究选择4个西葫芦品种,‘新一代早青’‘新翡翠早生’‘圣峰’‘抗病早青一代’,在田间调查了南亚果实蝇的产卵情况,在室内观察了其生长发育,并对西葫芦果实硬度、糖度和含水量与南亚果实蝇产卵、生长发育参数等进行了相关性分析。结果表明,4个西葫芦品种受南亚果实蝇为害从轻到重依次为‘抗病早青一代’‘新一代早青’‘新翡翠早生’和‘圣峰’。幼虫历期和蛹历期为取食‘圣峰’时最短,取食‘抗病早青一代’时最长。蛹重、羽化率和存活率为取食‘圣峰’时最高,取食‘抗病早青一代’时最低。其中,取食‘圣峰’的幼虫历期和存活率分别为8.26 d和64.95%,取食‘抗病早青一代’的幼虫历期和存活率分别为12.67 d和41.69%。果实糖度与产卵孔数呈显著正相关,与蛹重和存活率呈极显著正相关。果实硬度与单孔产卵数呈显著负相关,与产卵孔数和百克果肉虫数呈极显著负相关。南亚果实蝇在不同品种西葫芦上的成虫产卵偏好性和幼虫生长适应性符合“偏好-表现”假说。南亚果实蝇偏好在果实硬度低、糖度高的西葫芦品种上产卵,‘抗病早青一代’对南亚果实蝇表现为抗,‘圣峰’对南亚果实蝇表现为感。

几种诱抗剂对西瓜ZYMV的防治效果评价

为探索对西瓜病毒病具有防效作用的植物免疫诱抗剂,以小西葫芦黄花叶病毒(zucchini yellow mosaic virus,ZYMV)为防治对象,植株的显症率及相对防效为指标,评价了6种不同浓度的哌啶酸(Pip)、N-羟基哌啶酸(NHP)、没食子酸、苯并噻二唑(BTH)、壳寡糖、β–氨基丁酸(β-aminobutyric acid,BABA)及其2种药剂和3种药剂复配后对该病毒的防治效果。结果显示,单一药剂喷施后对西瓜ZYMV的防效从高到低依次为:NHP(0.5 mmol·L^(-1))、Pip(2 mmol·L^(-1))、壳寡糖(1 g·L^(-1))、没食子酸(0.5 g·L^(-1))、BABA(1 mmol·L^(-1))、BTH(0.1 mmol·L^(-1));复配药剂试验中,2种药剂复配防效最好的是2-Ⅶ(NHP 0.5 mmol·L^(-1)+Pip 2 mmol·L^(-1)),接种后11 d、无菌水对照植株显症率达到100.00%时,该组合处理的植株显症率为10.00%,相对防效达89.99%,但该复配药剂会影响植株生长;3种药剂复配防效较好的组合是3-Ⅰ(没食子酸0.5 g·L^(-1)+NHP 0.5 mmol·L^(-1)+BABA 1 mmol·L^(-1))和3-Ⅱ(没食子酸0.5 g·L^(-1)+NHP 0.5 mmol·L^(-1)+Pip 2 mmol·L^(-1)),显症率分别为27.27%、33.33%,相对防效分别为79.49%、68.27%,显著高于其他组合,其中3-Ⅱ处理的植株显症率增加缓慢,防病效果较其他处理持久,防治效果最优。综上,NHP、Pip和没食子酸3种诱抗剂在预防西瓜病毒病害中具有潜在的应用价值。

化肥减量配施生物有机肥对露地西葫芦产量、品质和养分分配的影响

【目的】探索适宜西北地区露地种植西葫芦的合理施肥模式。【方法】以西葫芦品种华玉为试验材料,设置不施肥(CK_(0))、常规施肥(CK_(1))、化肥减量30%平衡施肥+400 kg/667 m^(2)生物有机肥(T_(1)),化肥减量30%平衡施肥+600 kg/667 m^(2)生物有机肥(T_(2)),化肥减量30%平衡施肥+800 kg/667 m^(2)生物有机肥(T_(3))5个处理,研究对西葫芦生长指标、品质、产量、干物质和养分吸收分配的影响。【结果】化肥减量30%平衡施肥+600 kg/667 m^(2)生物有机肥(T_(2))处理经济效益最佳,且植株的株高、茎粗和叶片数显著高于常规施肥(CK_(1))处理,较CK_(1)处理,T_(2)处理总干物质质量、维生素C、可溶性糖、可溶性蛋白分别提高了9.84%、9.37%、8.21%和23.73%,硝酸盐含量降低了42.73%,同时,西葫芦果实的氮素、磷素和钾素积累量分别提高了2.50%、14.29%和10.99%。【结论】化肥减量30%平衡施肥+600 kg/667 m^(2)生物有机肥处理收益最佳,并显著提高西胡芦的品质和产量,促进西葫芦养分吸收与积累。

耐高温胁迫西葫芦种质资源评价和筛选

为筛选耐高温的西葫芦(Cucurbita pepo L.)种质材料,本试验以30份西葫芦种质资源为材料,分别设置了常温、高温两组不同温度处理,测定了不同处理后7 d的生长指标(株高、茎粗、全株叶面积、地上部鲜重、地上部干重、地下部鲜重、地下部干重)、相对电导率、丙二醛含量及热害指数。结果表明:高温下30份西葫芦种质资源的各项指标均呈显著性差异。根据聚类分析及隶属函数分析,可将30份西葫芦种质资源分为高温耐受性强、中、敏感三大类,筛选强高温耐受性品种为11号、27号、3号、8号、4号。相对电导率与丙二醛含量与热害指数有较高的相关性,可以作为评价西葫芦种质资源耐高温能力的快捷评价指标。

气相色谱法测定西葫芦中百菌清残留量的不确定度评定

参照NY/T 761—2008《蔬菜和水果中有机磷、有机氯、拟除虫菊酯和氨基甲酸酯类农药多残留的测定》,通过建立数学模型,对气相色谱法测定西葫芦中百菌清残留量的不确定度进行评定。分析量化了样品称样量、提取溶液体积、标准溶液配置、回收率、测量重复性、气相色谱仪6个不确定度分量,计算出合成标准不确定度和扩展不确定度。结果表明,西葫芦中百菌清添加量为0.1 mg/kg时,其测定结果为0.1069 mg/kg,扩展不确定度为0.0050 mg/kg。影响不确定度的主要因素是标准溶液配置、回收率、测量重复性和气相色谱仪。

榆中新营旱作地区西葫芦不同品种比较试验

2023年,榆中新营旱作地区引进17个西葫芦品种进行品种适应性试验,以期筛选出适合榆中新营旱作地区推广的西葫芦新品种。试验结果表明,适应性强,瓜色、综合性状突出的长条品种丰采601,圆形品种胖126、多宝,可在榆中新营旱作地区大面积推广种植。

10种药剂对西葫芦白粉病的田间防效

白粉病是西葫芦生产上的重要病害,为筛选出西葫芦白粉病防控药剂,通过田间试验比较了10种新型杀菌剂对西葫芦白粉病的防效。试验结果表明,400 g/L氯氟醚菌唑悬浮剂20 g/667 m^(2)、42%苯菌酮悬浮剂20 g/667 m^(2)、40%环丙唑醇悬浮剂10 g/667 m^(2)和20%吡噻菌胺悬浮剂30 g/667 m^(2)对西葫芦白粉病均有较好防效,且持效期较长,第2次药后7、14、21 d,上述4种药剂的防效均在90%以上。说明这些药剂可用于田间西葫芦白粉病的防控。

西瓜花叶病毒西葫芦分离物的基因组及其侵染性克隆

西瓜花叶病毒(watermelon mosaic virus,WMV)是危害瓜类作物的一种主要病毒,笔者分析了西葫芦分离物CH99/69的基因组序列和分子变异,构建了具有侵染性的全长cDNA克隆。结果显示,CH99/69分离物基因组全长为10047 nt,与其他分离物的全基因组核苷酸、多聚蛋白核苷酸和多聚蛋白氨基酸的序列一致性分别为81.40%~94.80%、81.40%~94.70%、88.40%~97.20%。基于全基因组序列的系统进化分析显示,CH99/69与中国的Urumqi火参果分离物、WMV-WS西葫芦分离物和法国的WMV-Fr西葫芦分离物亲缘关系较近,它们均聚于Ⅰ组中,而与中国的WMV-Pg人参分离物、WMV-GZca臭椿分离物、hollyhock蜀葵分离物亲缘关系最远。接种试验显示,CH99/69分离物的克隆具有侵染性,能系统侵染甜瓜、西瓜、西葫芦和瓠瓜,经接种产生的病毒后代能够通过摩擦接种进行侵染。

小西葫芦黄花叶病毒甜瓜分离物的基因组及其侵染性克隆

病毒侵染性克隆是病毒与寄主互作研究的有力工具,分析了小西葫芦黄花叶病毒(zucchini yellow mosaic virus,ZYMV)甜瓜分离物CH-87的基因组序列和分子变异,构建了具有侵染性的全长cDNA克隆。结果显示,CH-87分离物基因组全长为9592 nt,与其他分离物的全基因组核苷酸和多聚蛋白氨基酸的序列一致性平均值分别为91.42%、96.45%。基于CP蛋白和多聚蛋白氨基酸序列的系统进化分析显示,CH-87分离物与美国的BL-67南瓜分离物亲缘关系最近,与中国的CN∶Lc∶17丝瓜分离物亲缘关系次之,均聚于亚组Ⅴ中。接种试验显示,CH-87分离物的克隆具有侵染性,能系统侵染甜瓜、黄瓜、西瓜和西葫芦,经接种产生的病毒后代也具有侵染性。