Social Cost Analysis of Biological Control Technology for Crop Diseases and Insect Pests

With the rapid development of modern agriculture,the prevention and control of crop diseases and insect pests has become an important part to ensure the safety of agricultural production,the quality of agricultural products and the safety of agricultural ecological environment.Although the effect of traditional chemical prevention and control technology is remarkable,the health risks and environmental problems brought by it should not be ignored.As a green and environmentally friendly means of prevention and control,biological prevention and control technology has gradually become a hot research topic and a trend of agricultural production.This paper is intended to comprehensively evaluate the social costs of biological control technologies for crop diseases and pests,including the health risks reduced,environmental improvements,economic benefits,and barriers to promotion,and put forward corresponding policy recommendations.

Species and Control Techniques of Main Diseases and Insect Pests of Camellia oleifera in Anhui Province

[Objectives]The paper was to master the species,incidence regularity and control techniques of main diseases and insect pests of Camellia oleifera in Anhui Province.[Methods]The species of main diseases and insect pests of C.oleifera in major C.oleifera afforestation bases and seedling bases in Anhui Province were investigated through field survey and literature search.Afterwards,the symptom characteristics,occurrence regularity and harms of diseases and insect pests were analyzed,and scientific and reasonable control techniques were put forward.[Results]The main diseases of C.oleifera in Anhui Province were soft rot disease,blister blight,anthracnose,sooty blotch,etc.,and the main insect pests were Euproctis pseudoconspersa,Biston marginata,Hypomeces squamosus,Curculio chinensts,Chrenoma atritarsis,etc.The control techniques mainly included ecological regulation,physical prevention and control,chemical prevention and control,and biological prevention and control.[Conclusions]The results will promote the high-quality development of C.oleifera industry in Anhui Province,and contribute to the improvement of China s edible vegetable oil supply and national grain and oil security.

Effects of Rice-duck Mutualism on Diseases Insect Pests and Weeds and Economic Benefits

[Objective] Study on the effects of rice-duck mutualism on weeds and insects pests and economic benefits of paddy field. [Method] Comparison of the incidence of weeds, sheath blight and insects pest under rice-duck mutualism, conventional cultivation and control treatment, the yield and economic benefits were analyzed under the 3 treatments. [Result] Average occurrence of weeds in rice-duck mutualism group decreased by 2.33 and 52.0g ind/m^2 compared with that in conventional cultivation and control treatment ; the control rate of mutualism was up to 75% against rice hopper, but just between 25% -60% against rice leaf roller and Chilo suppressalis. The rates of diseased plant and diseased bell against rice sheath blight were higher and disease indices were lower compared with control group. The yield of mutualism group was identical with conventional cultivation, Which was greatly higher than that of control group. The results suggested an higher economic benefits and lower cost benefit ratio for rice-duck mutualism treatment. [Conclusion] Rice-duck mutualism gives birth to a positive effect to control the diseases, insect pests and weeds, as well as to economic benefits, providing basis on extension of rice-duck mutualism system.

Analysis and Study on Characteristics and Detection Methods of Cotton Diseases and Insect Pests

[Objectives]The paper was to find the diseases and insect pests in the process of cotton growth quickly,effectively and timely.[Methods]The growth process of cotton was dynamically monitored by UAV aerial photography,and the aerial data map was converted into geotif image with longitude and latitude and then inputted into the detection system for preprocessing,mainly for image feature extraction and classification.Through deep learning of MATLAB software and BP neural network algorithm,the feature similarity of the images in the established characteristic database of cotton diseases and insect pests was compared.[Results]Through comparative analysis of characteristics of a large number of diseases and insect pests,it was found that deep learning method had high discrimination accuracy and good reliability.[Conclusions]The dynamic detection system using deep learning can well find cotton diseases and insect pests,and achieve early detection and early treatment,so as to effectively improve the yield and quality of cotton.

Effects of silicon amendment on the occurrence of rice insect pests and diseases in a field test

Rice is one of the most important staple foods for the world population,but it is attacked by a number of destructive pests.While evidence from greenhouse and laboratory tests has shown that silicon（Si）amendment can confer enhanced resistance to pests in rice,few studies have directly demonstrated the Si-mediated protection from pests in a field situation.In this study,field plots with silicon amendments at 0,75,150 and 300 kg SiO2 ha-1 in early-and late-season rice were employed to evaluate the effects of silicon amendment on the occurrence of major insect pests and diseases and rice yield.Compared with the control plots without silicon amendment,plant damage by stem borer and leaf folder and population size of planthopper were significantly lower in three to five of the seven monitoring observations in each season in the plots amended with 300 kg SiO2 ha-1.The disease index of rice blast in the early-season rice was lower in the plots amended with Si at 300 kg SiO2 ha-1 than in the control plots,while Si protection from rice blast in the late-season rice and from rice sheath blight in the early-season rice were not apparent.An insignificant increase of rice yield by 16.4%（604 kg ha-1）was observed in the plots amended with 300 kg SiO2 ha-1 over the control plots.Our results indicate that Si amendment at 300kg SiO2 ha-1 can provide substantial protection from some of the rice pests under field conditions.These findings support the recommendation of silicon amendment as a key component of integrated management of rice pests.

A Brief Introduction of Main Diseases and Insect Pests in Soybean Production in the Global Top Five Soybean Producing Countries

The United States, Brazil, Argentina, India and China are the major soybean producing countries in the world. Nearly 90% of the world^s soybean production comes from these countries. The occurrence of diseases and insect pests often lead to the reduction of soybean yield, and brings varying degree losses to these countries. This article provides an overview of the impact and measures on soybean main diseases and insect pests in the top five major soybean producing countries over the world. It is concluded that the diseases affecting the soybean yield seriously include Phakopsorapachyrhizi, Heterodera glycines, Septoria glycines, Colletotrichum spp. and Macrophominaphaseolina; and the main insect pests include Anticarsia gemmatalis, Spodoptera litura, Nezara viridula and Frankliniella occidentalis, which will provide information for key prevention and control of soybean main diseases and insect pests in these countries.

Occurrence Characteristics,Prevention and Control of Pests and Diseases of Tropical Outdoor Cultivated Rosa chinensis

According to the hazards and occurrence characteristics of major diseases of Rosa chinensis, such as powdery mildew, branch canker and black spot, and major pests such as mites, aphids, thrips and Lepidoptera, prevention and control of the diseases and pests should be based on pruning, garden cleaning, water and fertilizer management, and chemical control can be applied as the supplement. Suitable prevention and control measures should be adopted for preventing the disea- ses and pests scientifically.

Occurrence and Control of Main Soybean Diseases and Insect Pests in Greater Mekong Sub-region

Soybean rust,soybean downy mildew,and soybean thrips,soybean pod borers,and soybean nocturnal moths are the world wide diseases and insect pests in soybean production,which pose a potential threat to soybean production in Great Mekong Sub-region（ GMS）,comprising Cambodia,Lao People＇s Democratic Republic,Myanmar,Thailand,Vietnam,and Yunnan province,the People＇s Republic of China. This paper summarized the host range,epidemiology,damage and control methods of these diseases and insect pests in GMS,with the aim to provide information basis for understanding and effective control of soybean diseases and insect pests in GMS.

Integrated Prevention and Control Technology of Major Diseases and Insect Pests of Strawberry

In order to effectively deal with the problems of diseases and insect pests in the growth process of strawberry and to improve the quality and yield of strawberry,the main diseases and insect pests in strawberry cultivation such as powdery mildew,gray mold,anthracnose,red stele root rot,calcium deficiency,salt or fertilizer damage,aphids,red spiders,thrips,grubs,etc.and their identification methods were analyzed.The comprehensive pollution-free prevention and control techniques of these pests and diseases were explored,in order to provide technical guidance for high quality,efficient and harmless production of strawberry.

Species and Occurrence Regularity of Diseases and Insect Pests Harming Baccaurea ramiflora Lour. in Guangxi

[Objectives]The paper was to understand the species and harm of diseases and insect pests of Baccaurea ramiflora Lour.in Guangxi,and to provide basis for the prevention and control of diseases and insect pests.[Methods]From 2018 to 2021,a systematic investigation on diseases and insect pests of B.ramiflora was conducted in Dongxing City,Fangchenggang City,Longzhou County,Pingxiang City,Jingxi City and Napo County in Guangxi.[Results]There were 22 species of diseases and insect pests that harmed B.ramiflora in Guangxi,7 of which were diseases and 15 were insect pests.Leaf blight(Fuasrium spp.)was the main disease at seedling stage,causing severe damage,and anthracnose(Colletotrichum gloeosporioides Penz.)caused moderate damage.Cyclosia papilionaris Drury and Chrysochus chinensis Baly had high frequency of occurrence,wide damage area and severe damage.Cyclosia panthono Stoll and Lcerya aegyptiaca Douglas caused moderate damage,while other insect pests caused light damage.[Conclusions]The study lays a foundation for the scientific prevention and control of B.ramiflora diseases and insect pests,and promotes the sustainable and rapid development of B.ramiflora industry in Guangxi.

Green Prevention and Control Technology against Main Diseases and Insect Pests of Facility Tomato

In recent years,with the increasing planting area of facility tomato,diseases and insect pests such as tomato grey mold(Botrytis cinerea),early blight(Alternaria solani),late blight(Phytophthora infestans),and whitefly(Trialeurodes uaporariorum) occur frequently,causing severe harms and difficulties in prevention and control.In order to ensure the normal production of facility tomato and improve the yield and quality of tomato,the corresponding prevention and control measures are put forward according to the regularity of the occurrence of diseases and insect pests and the characteristics of facility environment,which has certain guiding significance for agricultural production.

Detection and Monitoring of Key Hazard Factors for Quality and Safety of Characteristic Berries and Standardized Production Technology and Application

Blueberry,kiwifruit,Rosa roxburghii,and raspberry are the characteristic fruits planted in Guizhou Province.However,in recent years,harmful factors such as plant diseases and insect pests,pesticides and heavy metal residues have affected the quality and safety of blueberry,kiwifruit,R.roxburghii,raspberry and other berries.These problems mainly include the frequent occurrence of plant diseases and insect pests,pesticide residues and heavy metal pollution,which not only seriously affect the quality and safety of berries,but also restrict the healthy development of berry industry.Therefore,it is very important to study the detection and monitoring of key hazard factors affecting the quality and safety of blueberry,kiwifruit,R.roxburghii and raspberry,as well as the standardized production technology.Using literature analysis,field investigation,questionnaire survey,comprehensive analysis,SWOT analysis,laboratory testing and other methods,this paper made a comprehensive and in-depth study of the berry industry in Guizhou Province.Through the analysis of the current situation of the berry industry in Guizhou Province,the problems and shortcomings in the planting,management,sales and other aspects of the industry were revealed.In order to solve these problems,a series of practical measures were put forward,including strengthening pest control,optimizing pesticide application technology,and strictly controlling heavy metal pollution,so as to ensure the healthy and stable development of berry industry.The implementation of these measures will help to improve the overall quality level of the berry industry in Guizhou Province.

Evaluation and screening for resistance of some varieties(lines)to major diseases and insect pests of rice

During 1984-1988,2,231 varieties(lines)from International Rice Testing Program(IRTP)were evaluated and screened for resistance to riceblast(Bl),bacterial blight(BB),sheath blight

Effects of Seed Reservation-oriented Cultivation on Seed Quality and Disease and Insect Damages of Maca

[Objective] The aim was to explore the effects of cultivation and seed reservation methods on quality and disease/insect damages of maca seed in cold highland areas,providing scientific references for cultivation and seed reservation and planning of maca vareity.[Method] Yellow,purple and black maca were selected and cultivated in the region with an elevation of 3 000 m to be experimental materials and cultivation and seed reservation methods were as follows：maca seed reservation in situ,seed reservation in original soils maca grown after selection of maca balls,and seed reservation in the region with an elevation of 2 700 m after selection of maca ball,seed reservation in greenhouses in the region with an elevation of 2 400 m after selection of maca ball,and growing selected balls in greenhouses and transplanting to the farmlands with an elevation of 2 400 m.[Result] The cultivation and seed reservation methods had significant or extremely significant effects on maca phenological phase;maca in different colors were treated by different cultivation and seed reservation methods,showing insignificant effects on disease and insect damages.[Conclusion] It can be concluded that the selected maca balls stored for 15 d as per the method grown in the region with an elevation of 2 700 m will improve seed quality and reduce disease or insect damages.

Impact of Climate Change on Epidemiology of Various Pests of Wheat Crop in Punjab Pakistan

Wheat [Triticum aestivum L. (Poaceae)] is the staple diet of people in Pakistan. It is attacked by many types of pests. Therefore the purpose of this study was to assess the impact of climate change on the ecology and epidemiology of various wheat pests in Punjab, Pakistan. Results indicate that maximum weeds hot spots 242 (5.98%) Phalaris minor, 45 (1.18%) wild oat and 203 (5.01%) broad leaf weeds were noted in 2015. Aphid 31 (0.86%) hot spots were recorded in 2016 while maximum army worm 13 (0.26%) hot spots were noted in 2017. Maximum 70 (1.73%) spots of yellow rust and 85 (2.10%) hot spots of brown rust were observed during 2015 while 84 (4.16%) spots of loose smut were observed during 2017. ANOVA shows that years have no significant difference (P > 0.05) but weeks have significant effect on occurrence of these pest incidences except brown rust. But regression ANOVA was significant (P ≤ 0.05) and regression models equations have been developed on the bases of recorded data. Pest incidence was taken as dependent variable Y and weather factors i.e. minimum temperature as X1, maximum temperature as X2, relative humidity as X3 and rain fall as X4 were taken as independent variables. This study will help in recommendations for moving forward aiming at integration of biology of rust and smut diseases of wheat with changing climate for development of resistant varieties for resilient and durable management of these pathogens.

Do forest health threats affect upland oak regeneration and recruitment?Advance reproduction is a key co-morbidity

We analyzed national forest inventory data collected from circa 2000–2018 across 37 states in the eastern United States to better understand the influence of forest health related canopy disturbances on the regeneration and recruitment dynamics of upland oaks(Quercus).We found low levels of oak recruitment across all disturbance types examined but limited evidence of any direct effects from the type of disturbance on the population of regenerating oaks.The general lack of differences in oak regeneration response between forest health disturbances and disturbances caused by harvested or non-disturbed plots does not indicate that the effects of forest health disturbances were benign,however.Instead,low level of oak recruitment across all disturbance types highlights the pervasiveness of the trend of shifting composition in once oak-dominated forests where oak is absent or sparse in the regeneration layer.Our results show that oak recruitment was higher when oak was present as advance reproduction prior to disturbance from any cause examined.Collectively,these results lead us to conclude that the widespread inadequacy of oak advance reproduction in mature oak-dominated forests is the prevailing threat to oak forest health and sustainability.We suggest the status of advance reproduction be treated as a co-morbidity when weighing the risk and potential outcomes from other threats to upland oak forests in the eastern United States.

我国设施园艺病虫害发生特点与绿色防控策略

我国设施园艺发展迅速,对促进农业现代化、乡村振兴和都市农业发展具有重要作用。本文结合我国设施园艺产业的发展现状,总结设施环境下病虫害发生特点,并从农业防治、物理防治、生物防治、生态调控、生物技术和科学用药等方面概述了病虫害防治技术,最后对设施园艺病虫害防治提出建议,以期为我国设施园艺的健康可持续发展提供参考。

新疆棉花病虫害防治药剂剂型研发策略

棉花是我国重要的经济作物,也是受病虫害危害最严重的农作物之一。目前化学防治仍是棉田病虫害防治的重要技术。新疆棉区是我国最大的棉花主产区,气候类型属于典型的温带大陆性气候,具有光照充足、夏季高温干旱、多风、昼夜温差大等特殊气候特点,农药药液喷施过程中容易发生蒸发、飘移、降解等损失,严重影响药剂的防治效果。本文综述了温湿度、风、光照等环境因子对药剂防治效果的影响,以及国内外对提升药剂防治效果采取的调控措施,并结合新疆棉田的特殊气候条件提出了剂型研发的新策略。在提升产品理化稳定性的前提下,还需综合考虑有效成分的理化性质、棉花叶片的结构及润湿特性、施药器械等多种因素。结合农药学、植物保护学、界面化学、有机化学等多学科交叉理论知识指导,利用先进的技术和载体材料研发环境响应型、靶向高效的农药剂型,结合配套使用技术及措施,探索农药高效利用及减量调控途径,为实现农药减量增效、引领棉花产业绿色发展提供科技支撑。

2022-2023年度湖南省油菜病虫害防控植保贡献率评价

为科学评估病虫害对油菜生产的影响程度和植保措施减损增产的重要作用,湖南省植保植检站在祁东、鼎城、桃江、永兴组织开展2022—2023年度油菜病虫害防控植保贡献率评价工作。通过设置严格防控、统防统治、农户自防和完全不防治病虫(对照)处理,采用大区试验,评估不同试验县(区)不同油菜病虫害防控处理的植保贡献率。结果表明:各试点处理的实际损失率为0.17%~67.56%,病虫害防控处理的植保贡献率为4.10%~67.56%。调查统计结果显示,参试县(区)油菜病虫害防控(不含杂草)植保贡献率分别为祁东25.73%、鼎城35.49%、桃江23.50%、永兴33.36%;湖南省油菜病虫防控植保贡献率为28.51%,据此测算,2022—2023年度全省通过病虫害防控约挽回菜籽损失7.38亿kg。

山核桃丰产栽培管理技术

研究了山核桃树的生长习性、栽培条件、播种育苗、定植密度、修剪整形、施肥灌溉和病虫害防治等,总结了一套适合我国不同地区的山核桃丰产栽培管理技术体系。采用合理的栽培措施,可以显著提高山核桃树的成活率、生长势、开花坐果率、单果质量和产量,同时也可以改善山核桃的品质,增加经济效益和社会效益,为山核桃的推广和发展提供科学依据和技术指导。