Occurrence Factors and Efficient Green Prevention and Control Technology of Peanut Stem Rot Caused by Sclerotium rolfsii in Southern Mountainous Area of Shandong Province

Peanut stem rot caused by Sclerotium rolfsii is a soil-borne disease,and it has become the main disease of peanut in Yimeng mountainous area.S.rolfsii survives the winter as mycelia and sclerotia in soil and debris,becoming the primary source of infection in the following year.The disease resistance of peanut varieties,high temperature and humidity,and cultivation measures are the pathogenic factors affecting the occurrence of peanut stem rot.The disease can be effectively controlled by screening disease-resistant varieties and seed chemical treatment,improving soil by deep tillage and crop rotation,carrying out flowing water management of affected field,cutting off transmission routes,and strengthening seed dressing and triple spraying control.

Streptomyces sp. RP1A-12 mediated control of peanut stem rot caused by Sclerotium rolfsii

Sclerotium rolfsii Sacc. is a destructive soilborne fungal pathogen with a wide host range that includes peanuts. Biological control offers an interesting alternative to fungicides for sustainable management of soilborne diseases. The current investigation is aimed at evaluating one potential biocontrol agent Streptomyces sp. RP1 A-12 for growth promotion and the management of peanut stem rot disease caused by S. rolfsii under field conditions. Preliminary studies conducted under in vitro and the greenhouse conditions showed promising results against the stem rot pathogen. Further in vitro and pot experiments conducted to assess Streptomyces sp. RP1 A-12 for its growth promoting abilities using whole organisms have shown an increase in seed germination, root and shoot length. Other parameters like nodule number and plant biomass were also significantly increased over control treatments indicating that the test bioagent possesses growth promoting abilities along with disease suppression capabilities. Subsequently field studies were carried out for two consecutive rainy seasons. The bioagent was applied as whole organism and partially purified crude metabolites. Results indicate the bioagent reduced stem rot disease incidence by 64–67% and 22–49% respectively in two field trials conducted with notable increase in yield. Partially purified Streptomyces sp. RP1 A-12 metabolites exhibited an even greater effect in reducing the incidence and severity of stem rot compared to the pathogen inoculated control.

Effects of Returning Methods on Wheat Stem Rot and Yield

[Objectives]This study was conducted to improve the quality of straw returning to the field,enhance wheat disease resistance and ensure high and stable yield of wheat.[Methods]The effects of four returning modes on wheat stem rot and yield were studied by observation and experiments.[Results]The incidence rate and disease index of stem rot and white head rate of wheat were significantly reduced and the yield was significantly increased by adopting the method of straw returning to the field with the separation of"returning and seeding".The incidence rate and disease index of stem rot and white head rate of wheat were higher than those of the CK and the yield was significantly reduced when adopting the straw returning method of direct sowing.Treatment T_(1)(after maize was harvested,fertilizers,a nutrient-loaded microbial agent and a soil conditioner were evenly spread on the surface of straw,which was then returned to the field using a straw returning machine twice,and then ploughing,soil preparation and wheat sowing were carried out)showed an incidence rate of wheat crown rot 54.8%lower than that of the CK and a white head rate 87.5%lower than that of the CK,and the yield was 2305 kg/hm^(2) higher than that of the CK.[Conclusions]Straw returning can increase soil organic matter content,reduce soil bulk density,enhance soil respiration,and improve wheat disease resistance and yield.

Phenotypic identification of peanut germplasm for resistance to southern stem rot

Southern stem rot,caused by Sclerotium rolfsii Sacc.,is a destructive soil fungal disease of peanut in China and other countries.To evaluate resistant germplasm,a total of 256 peanut accessions were investigated on their resistance to southern stem rot in 3 environments by artificial inoculation.Variance analysis indicated that disease index was significantly influenced by environment,genotype and genotypeenvironment interactions.Peanut accessions of var.vulgaris type exhibited higher resistance to southern stem rot.Disease index was significantly negatively correlated with linoleic acid content,while positively correlated with oleic acid content.Six resistant accessions were identified,including Hua 28,Shandongzai,ICG 6326,Quanhua 7,Quanhua 9 and Guihua 836,with their disease indexes under 40 and mortality were less than 30%in the three environments.The identified resistant accessions showed the great potential to be applied in resistant peanut breeding,and would be good genetic resources for enhancing the resistance to southern stem rot.

Co-location of QTL for Sclerotinia stem rot resistance and flowering time in Brassica napus

Sclerotinia stem rot(SSR) caused by Sclerotinia sclerotiorum(Lib.) de Bary is one of the most devastating diseases of Brassica napus worldwide. Both SSR resistance and flowering time(FT) adaptation are major breeding goals in B. napus. However, early maturing rapeseed varieties, which are important for rice-rapeseed rotation in China, are often highly susceptible to SSR. Here, we found that SSR resistance was significantly negatively correlated with FT in a natural population containing 521 rapeseed inbred lines and a double haploid(DH) population with 150 individual lines, both of which had great variation in FT. Four chromosomal regions on A2, A6, C2, and C8 affecting both SSR resistance and FT were identified using quantitative trait loci(QTL) mapping after constructing a high-density genetic map based on single nucleotide polymorphism markers in the DH population.Furthermore, we aligned QTL for the two traits identified in the present and previous studies to the B. napus reference genome, and identified four colocalized QTL hotspots of SSR resistance and FT on A2(0–7.7 Mb), A3(0.8–7.5 Mb), C2(0–15.2 Mb), and C6(20.2–36.6 Mb). Our results revealed a genetic link between SSR resistance and FT in B.napus, which should facilitate the development of effective strategies in both early maturing and SSR resistance breeding and in map-based cloning of SSR resistance QTL.

Application of Trichoderma harzianum in the control of basal stem rot of oil palms

The palm, Elaeis guineensis, has its origins in Africa but is planted on a commercial basis in several countries. Statistics for 2002 showed that in the lead for land mass under oil palm cultivation is Indonesia, at 3,769,000. ha, followed by Malaysia at 3,376,000. ha; however, the world’s leading producer of palm oil is still Malaysia, since the 1970’s. Both countries are predicted to produce 82.4% of the world’s palm oil production by the year 2005. However, the palm is susceptible to basal stem rot, a devastating disease which results in direct loss of field stands and to which no effective chemical control is yet available. Caused by Ganoderma boninense, infected palms appear symptomless, at the first sign of disease, at least 50% of the internal trunk tissue stem would have actually rotted. This study investigated the efficacy of Trichoderma harzianum (isolate FA 1132) as a biological control agent, using 6-month old oil palm seedlings as models and the experiment performed in a greenhouse at 29- 30 ℃. ambient conditions. The plants were artificially infected with G. boninense and a conidial suspension of 1×109-9×109 spores/mL was applied as a soil drench at 1L/plant every 2 weeks for 20 weeks. The parameters examined were efficacy of the biocontrol agent and the effect of Trichoderma- incorporated mulch in addition to the soil drench. Efficacy was assessed in terms disease severity index (DSI) where a higher percentage indicates a higher severity. Results showed that infection first sets in on untreated plants at week 12 and got worse progressively. The completely untreated plants were all infected and the DSI at 20 weeks after infection (wa.i.) was 92.5%. Plants given only a Trichoderma -infused food base supplement without conidial suspension gave a DSI of 70% whereas those given a conidial soil drench without supplemental food base gave a DSI of 85% at 20 w.a.i. Infected plants given a conidial treatment together with a food base supplement gave a DSI of 5% at 20 w.a.i. This investigation showed that there is potential in the use of T. harzianum (isolate FA 1132) as a biological control agent of basal stem rot and warrant further studies in its mass propagation for field trials.

Colonization by Klebsiella variicola FH-1 stimulates soybean growth and alleviates the stress of Sclerotinia sclerotiorum

Sclerotinia stem rot,caused by Sclerotinia sclerotiorum,is a destructive soil-borne disease leading to huge yield loss.We previously reported that Klebsiella variicola FH-1 could degrade atrazine herbicides,and the vegetative growth of atrazine-sensitive crops(i.e.,soybean)was significantly increased in the FH-1-treated soil.Interestingly,we found that FH-1 could promote soybean growth and induce resistance to S.sclerotiorum.In our study,strain FH-1 could grow in a nitrogen-free environment,dissolve inorganic phosphorus and potassium,and produce indoleacetic acid and a siderophore.The results of pot experiments showed that K.variicola FH-1 promoted soybean plant development,substantially improving plant height,fresh weight,and root length,and induced resistance against S.sclerotiorum infection in soybean leaves.The area under the disease progression curve(AUDPC)for treatment with strain FH-1 was significantly lower than the control and was reduced by up to 42.2%within 48 h(P<0.001).Moreover,strain FH-1 rcovered the activities of catalase,superoxide dismutase,peroxidase,phenylalanine ammonia lyase,and polyphenol oxidase,which are involved in plant protection,and reduced malondialdehyde accumulation in the leaves.The mechanism of induction of resistance appeared to be primarily resulted from the enhancement of transcript levels of PR10,PR12,AOS,CHS,and PDF1.2 genes.The colonization of FH-1 on soybean root,determined using CLSM and SEM,revealed that FH-1 colonized soybean root surfaces,root hairs,and exodermis to form biofilms.In summary,K.variicola FH-1 exhibited the biological control potential by inducing resistance in soybean against S.sclerotiorum infection,providing new suggestions for green prevention and control.

Research on Chemical Prevention and Control against Stem Base Rot of Sweet Potato

[Objective]The paper was to effectively control stem base rot of sweet potato.[Method]Chemical prevention and control test against stem base rot of sweet potato were conducted for consecutive three years from 2016 to 2018.[Result]The use of carbendazim or carbendazim+mancozeb,and carbendazim+embamycin had significant control effect on stem base rot of sweet potato.However,the applied concentration should be higher than the recommended concentration.Especially the concentration of 50%carbendazim WP should be no more than 300 times,and the prevention and control effect of 100 times dilution would be better.[Conclusion]The types and concentrations of prevention and control agents are determined in the test,which will provide certain basis for chemical prevention and control against stem base rot of sweet potato.

Evaluation of phytophthora root rot-resistant <i>Capsicum annuum</i>accessions for resistance to phytophthora foliar blight and phytophthora stem blight

A mixture of six Georgia isolates of Phytophthora capsici (Leon.), the causal agent of phytophthora blight, were used for greenhouse mass screening of over 700 accessions of Capsicum annuum for both stem blight and foliar blight. From this screening, it was determined that resistance to both forms of the disease were relatively common in the germplasm, but resistance to one form of the disease was not strongly correlated to resistance to the other form. Ten accessions previously shown to possess root rot resistance were tested for resistance to stem rot and leaf blight, and were found to also be highly resistant to these forms of the disease. It appears that single accessions have resistance to foliar, stem and root rot caused by P. capsici, which may simplify breeding for resistance to all three forms of the disease.

甘薯抗茎腐病鉴定技术的建立及种质资源抗性分析

为优化甘薯种质抗茎腐病鉴定技术,通过分析不同的接种方法和菌液浓度对甘薯种质抗性的影响,建立甘薯抗茎腐病鉴定标准,为甘薯抗病育种奠定基础。利用组培瓶蛭石薯苗擦伤接菌法和最佳接种菌液浓度(1.1×10^(7)CFU·mL^(-1)),对最具代表性的6个甘薯品种进行接种鉴定,并与田间抗性品种比较进行验证,室内接种抗性鉴定结果与田间抗性表现基本一致,表明新抗性鉴定技术的鉴定结果具有准确性、可靠性。进一步对65个甘薯材料进行抗病鉴定,发现绝大部分材料表现为感病或中感,7份种质(YD7002、DY7082-1、浙紫薯1号、TF1118、DY7032、南薯88和浙紫薯4号)对甘薯茎腐病具有稳定抗性。文章建立了甘薯抗茎腐病的新鉴定技术,鉴定和筛选出对甘薯茎腐病表现稳定抗性的种质,为甘薯抗茎腐病育种提供重要的种质资源,对于甘薯病害防控具有重要意义。

苍耳茎腐病病原菌鉴定及其杀真菌剂室内筛选

【目的】探究引起苍耳茎腐病的一种病原菌,并通过室内抑菌试验挖掘在多菌灵、抑霉唑、腐霉利、噻菌灵、甲基托布津、咯菌腈和咪鲜胺7种杀真菌剂中对病原菌抑制效果最佳的农药品种。【方法】采用菌丝尖端切割法从发病苍耳茎基部分离病原菌,通过科赫氏法则验证苍耳茎腐病病原菌。对病原菌的菌落、菌丝和菌核进行形态特征观察,通过分子生物学PCR技术扩增其ITS和TEF1⁃α序列并克隆测序,进一步分析鉴定病原菌种类,并对苍耳茎腐病病原菌进行室内杀真菌剂的筛选。【结果】分离到的6株病原菌与罗耳阿太菌(Athelia rolfsii)形态特征一致。将其菌丝和菌核分别接种于健康的苍耳茎基部,约1周后实验组出现与田间发病苍耳植株相同的茎腐病病症。NCXS⁃1克隆测序序列与数据库中的多个A.rolfsii菌株的相应序列一致性为100%;所筛选的7种农药杀菌剂中,NCXS⁃1对多菌灵、抑霉唑、腐霉利、噻菌灵和甲基托布津不敏感,而咯菌腈和咪鲜胺对A.rolfsii的菌落生长具有一定的抑制作用,其中以咯菌腈的抑制作用最强,EC_(50)为0.12 mg/L。【结论】明确引起苍耳茎腐病的病原菌为A.rolfsii。7种农药中咯菌腈是抑制苍耳茎腐病病菌生长效果最佳的杀真菌剂。研究结果可为苍耳茎腐病的有效防控提供科学依据。

4种杀菌剂对甘薯茎腐病的防治效果研究

为筛选出防治甘薯茎腐病的有效药剂,研究了4种杀菌剂对甘薯茎腐病的防治效果,结果表明,薯苗生长前期用90%(质量分数,下同)氯溴异氰尿酸稀释液滴灌根部,防治效果可达94.64%;用70%甲基硫菌灵稀释液在栽插前浸苗20 min配合栽后每10 d滴灌1次,防治效果为68.53%;用可杀得3000(46%氢氧化铜)稀释液或6%春雷霉素水剂稀释液浸苗配合叶面喷施,防治效果均低于40%.因此,90%氯溴异氰尿酸稀释液可作为甘薯茎腐病防控的有效药剂.

甘薯茎腐病室内药剂筛选及田间防治效果评估

通过室内毒力测定及大田试验进行药剂筛选,筛选出对甘薯茎腐病的有效防控药剂,以期为甘薯茎腐病的防治提供新的途径。采用含毒介质法中的最低抑制浓度法,对19种药剂进行室内毒力测定,并在此基础上选取6种防治效果较好的药剂开展田间防治试验。结果表明,室内毒力测定中溴硝醇的抑菌效果最强,抑菌最低有效浓度为4.69 mg·L^(-1),其次为噻霉酮、中生菌素、春雷霉素(加收米)、土霉素、硫酸链霉素、春雷·噻唑锌,抑菌最低有效浓度分别为7.50、18.25、28.13、37.50、75.00、150.00 mg·L^(-1)。大田试验选取的6种药剂中,春雷·噻唑锌的防治效果最佳,可达82.16%,其次噻霉酮、中生菌素、溴硝醇和春雷·中生的防治效果分别为79.55%、77.18%、76.56%、75.02%,均可作为田间甘薯茎腐病的有效防控药剂。

满天星茎腐病中一种新病原菌的分离与鉴定

满天星是当今世界最流行的鲜切花配花之一,茎腐病是满天星的一种常见病害,严重时导致植株枯萎死亡,影响鲜花的观赏性和利用价值,造成一定的经济损失。2021年3月,笔者在云南省昆明市海口镇发现满天星茎腐病,该病主要为害茎基部,表现为茎基部腐烂和萎蔫。为明确其病原,本研究对满天星茎腐病病原菌进行分离与鉴定。柯赫氏法则证明该分离物可造成满天星组培苗和盆栽苗表现出与田间病株相似的症状,经接种后获得的分离物与田间自然发病的分离物一致。通过形态学鉴定,分离物能产生大量致密的气生菌丝,颜色从白色到淡橙色或黄色不等,菌落背面有暗红色色素沉积。显微镜观察发现其分离物的分生孢子呈镰刀形,腹面较平直,背侧呈拱形,具有3~6个隔膜,分生孢子大小为(21.1~57.9)μm×(2.7~5.1)μm(n=100),未见小型分生孢子,形态学上与镰刀菌属病原真菌相似。通过对其ITS基因序列与形态学鉴定,将分离物初步确定为禾谷镰孢复合种(Fusarium graminearum species complex,FGSC),为进一步确定亚种,使用翻译延伸因子(TEF-1α)序列进行测序,发现该分离物与南方镰孢菌(F.meridionale)的同源性达100%。因此结合形态学和分子生物学特征,满天星茎腐病的病原确定为南方镰孢菌。目前国内尚未发现由南方镰孢菌侵染为害满天星茎部的相关研究报道,本研究结果将为防治满天星病害提供重要理论依据。

贝莱斯芽孢杆菌2L-1对两种芝麻病害的生防作用及机理研究

本文采用含毒介质法测定了贝莱斯芽孢杆菌(Bacillus velezensis)2L-1的发酵上清液对植物病原真菌的抑菌活性,通过盆栽试验测定了菌株2L-1对芝麻茎点枯病及芝麻棒孢叶斑病的防治效果,及其对4种作物的促生作用。为明确菌株2L-1的生防作用及机理,对其拮抗过程中的酶活性及促生相关特性进行了检测,对菌株2L-1进行了全基因组测序和次级代谢产物基因簇预测。结果表明,在含毒介质法中,发酵上清液的10倍稀释液对芝麻茎点枯病菌和芝麻棒孢叶斑病菌的抑制率分别为91.51%和83.78%。该菌株可分泌纤维素酶、蛋白酶和木聚糖酶,具备溶磷和产生铁载体的特性,皿内未检测到葡聚糖酶和几丁质酶活性。在盆栽试验中,当该菌株先于菜豆壳球孢(Macrophomina phaseolina)接种芝麻幼苗时的防治效果为45.37%,而当菜豆壳球孢先于该菌株接种芝麻幼苗时的防治效果为29.71%;当该菌株先于山扁豆生棒孢(Corynespora cassiicola)接种芝麻幼苗时的防治效果为25.82%,而当山扁豆生棒孢先于该菌株接种芝麻幼苗时的防治效果为33.64%。菌株2L-1的1×10^(8) cfu/mL菌悬液对供试作物的株高、鲜重和干重都有显著的促生作用,其中供试作物的株高增加26.52%~36.26%,地上部分鲜重增加71.43%~113.64%,干重增加50.00%~128.57%。在该菌株基因组中预测到12个次级代谢产物基因簇。由此可见,菌株2L-1在芝麻防病和促生中具备应用潜力。

10种杀菌剂对德国鸢尾茎腐病菌的室内毒力测定

为筛选适宜的杀菌剂防控德国鸢尾茎腐病,测试亮盾、噁霉灵、瑞至等10种杀菌剂对德国鸢尾茎腐病菌木贼镰刀菌和尖孢镰刀菌的防控效果。结果表明,10种药剂对德国鸢尾茎基腐病病原菌菌丝的生长均有不同程度的抑制作用。其中,抑制效果最好的是解淀粉芽孢杆菌;较好的4种药剂分别为精甲·咯菌腈、噁霉灵、唑醚·甲菌灵、双炔酰菌胺·百菌清,它们对木贼镰刀菌的EC_(50)分别为1.809、61.210、55.570、17.408mg/L,对尖孢镰刀菌的EC_(50)分别为141.9、13.572、39.186、71.251mg/L。

草莓茎基腐病病原菌鉴定、致病力分析及防治药剂筛选

浙江是中国草莓主要种植区。为明确引起浙江省建德市草莓茎基腐病的病原菌,筛选有效防治药剂,本研究从浙江省建德草莓基地采集具有草莓茎基腐病典型症状的样本,进行病原菌分离鉴定,并对病原物的生物学特性、寄主范围和防治药剂展开研究。结果显示,从茎基部病健交界处分离出形态一致的黄色、圆形、粘稠状、透明锃亮,散发刺激性气味的菌落,经形态学、分子生物学和生理生化特性鉴定,确定该病原菌为菠萝泛菌(Pantoea ananatis)。该病原菌适合在中性及偏碱性环境生长,最适生长pH值为8,最适生长盐浓度为1%~5%,最适生长温度为28℃。经寄主致病性测定发现,P.ananatis草莓致病菌株还能够侵染番茄、辣椒、西瓜和水稻,但对白菜、西兰花和豆角没有致病性,且与P.ananatis水稻致病菌株的致病性有明显差异。室内防治药剂筛选发现在20种供试药剂中有4种对P.ananatis具有抑菌效果,其中50%福美双可湿性粉剂抑菌效果最好,抑制中浓度(EC_(50))值为20.8057 mg·L^(-1),可作为防治草莓茎基腐病的主选药剂。研究结果为后续草莓茎基腐病有效防治提供了理论依据,同时为研究P.ananatis的致病机理提供了参考。

鳄梨蒂腐病毛色二孢属真菌对6种杀菌剂的敏感性

由毛色二孢属(Lasiodiplodia spp.)真菌引起的蒂腐病是对采后鳄梨最具破坏性的病害。为明确鳄梨蒂腐病原群体对杀菌剂的敏感性及6种不同类型杀菌剂在鳄梨蒂腐病防治中的应用潜力,采用菌丝生长速率法测定了来自海南和云南省鳄梨种植区的101个蒂腐病菌菌株对6种内吸性杀菌剂的敏感性,以优势种L. pseudotheobromae建立该种群的敏感性基线。结果表明:多菌灵、甲基硫菌灵、咪鲜胺和苯醚甲环唑对蒂腐病菌菌丝生长均表现出强烈的抑制活性,其平均EC_(50)值分别为(0.06±0.04)、(0.72±0.49)、(0.86±0.98)和(1.25±1.38)μg/mL。其中优势种L. pseudotheobromae对上述4种杀菌剂的敏感性均呈连续单峰曲线,符合正态分布,可将相应的平均EC_(50)值作为鳄梨蒂腐病菌对上述4种杀菌剂的敏感性基线。分别有4%和8%的菌株其咪鲜胺和苯醚甲环唑的平均EC_(50)值大于5μg/mL;91%和100%的菌株对吡唑醚菌酯和嘧菌酯敏感性很低,平均EC_(50)值分别高达(371.03±353.38)和(622.86±771.28)μg/mL,且为非正态分布。同时,针对上述可能已产生抗药性的菌株的靶标基因进行了测序和表达量分析,qRT-PCR结果表明:供试菌株中咪鲜胺和苯醚甲环唑的靶标基因CYP51未发生任何点突变,但经药剂处理12 h后,抗性菌株CYP51基因表达量较敏感菌株显著上调,推测该基因的过表达与病原菌对咪鲜胺和苯醚甲环唑的抗药性形成有关;然而,抗性菌株吡唑醚菌酯和嘧菌酯的靶标基因Cyt b却既没有发生点突变也没有呈现过表达,因此其抗药性形成机制还有待进一步探究。研究表明,我国鳄梨蒂腐病菌对多菌灵和甲基硫菌灵非常敏感,2种杀菌剂可考虑作为鳄梨蒂腐病防治的优先候选药剂,但该病原菌对另外2种供试杀菌剂的潜在抗性也不容忽视。

硅对油菜抗菌核病侵染及抗氧化酶活性的影响

为确定菌核病菌侵染下外源硅对油菜抗病性及抗氧化酶活性的影响,在油菜初花期用菌核病菌丝块分别对喷施硅和清水对照下的不同抗性油菜品种进行接种,随后测定其病情指数和抗氧化酶活性.结果表明:使用抗病品种和施加外源硅的病情指数在不同时间段均显著低于其他处理;油菜菌核病侵染后,不同品种抗性处理、施用硅处理和各个组合处理之间的POD、PPO、PAL和SOD酶活性存在显著差异;抗病品种与外源硅协同应用的4种抗氧化酶的活性峰值及抗氧化酶活性增长速度均显著高于其他处理.采用油菜抗病品种的同时施用外源硅能够有效抑制油菜菌核病的侵染扩张.

小麦茎基腐病原菌定量检测方法构建及应用

为进一步明确天津地区小麦茎基腐病发病状况并开展防控预测,针对小麦茎基腐两大主要病原菌假禾谷镰刀菌和小麦根腐离蠕孢菌,建立病原菌实时荧光定量检测体系。基于病原菌ITS序列设计并筛选出特异性引物Fpg-qrt-F/R和Bs-qrt-F/R,扩增片段大小分别为298 bp和116 bp。以病原菌基因组为标准品构建实时荧光定量标准曲线,建立了病原菌含量检测方法,并对天津地区小麦茎基腐发病田小麦根际土壤及麦种中携带假禾谷镰刀菌和小麦根腐离蠕孢菌的含量进行了定量检测。试验结果表明:天津地区发病田块小麦根际土壤中假禾谷镰刀菌基因组含量为0.3438~77.6867 pg.g^(-1),小麦根腐离蠕孢基因组含量为1.6853~844.2290 pg.g^(-1)。此外对15个不同地区的小麦种子进行检测,其中假禾谷镰刀菌检出率为40%,麦种带菌量为0.2617~0.2690 pg.g^(-1),未检出小麦根腐离蠕孢。本研究建立了病原菌荧光定量检测体系,摸清了天津地区小麦茎基腐的发病情况,确定了病田土壤中小麦茎基腐病原菌菌量的最低阈值,为相关土传病害的发生提供早期预警。