Occurrence Dynamics and Countermeasure of Wheat Crown Rot in Weifang City

Wheat crown rot was first found in Weifang City in 2015,and now has become a major disease of wheat,showing an aggravating trend year by year.The author investigated the occurrence area and characteristics of wheat crown rot in Weifang City over the past 5 years,and analyzed the causes of the disease.The disease was mainly related to variety resistance and farming system.According to the occurrence regularity of the disease,a set of comprehensive control measures were put forward.

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.

Occurrence Dynamics of Agrotis ypsilon (Rottemberg) in Weifang

[Objective]The paper was to monitor the occurrence dynamics of Agrotis ypsilon in Weifang and to clarify its occurrence regularity.[Method]High-altitude trap lamp and ground trap lamp were used to trap insects respectively.The lamps were automatically turned on at 19:00 every day,and monitored for 12 h until 7:00 am.The species of insects trapped by lamps was recorded every day,and the number of each species was counted.[Result]The peak periods of A.ypsilon caught by high-altitude trap lamp were basically consistent with those caught by ground trap lamp,indicating that A.ypsilon was more likely to immigrate from local area of Weifang.[Conclusion]The study provides theoretical support for migration prediction and early warning of A.ypsilon in Weifang.

Tungsten oxide thin films for highly sensitive triethylamine detection

Metal oxide semiconductor(MOS)thin films are promising sensing layer for integration in gas sensor devices for detecting toxic and harmful molecules.Herein,tungsten oxide(WO_(3))thin films are deposited on interdigital electrodes by vacuum thermal evaporation to realize batch fabrication of high-performance gas sensors.Subsequent annealing at different temperatures allows for regulation of the concentration of oxygen vacancies in the WO_(3) films,which has been found to exert a great influence on the sensor properties.In addition,the surface structure of WO_(3) films is also highly dependent on the annealing temperature.Gas sensing investigations show that the WO_(3) sensor annealed at 500℃ pos-sesses the best sensing properties for detecting triethylamine(TEA)including very high response,good selectivity,fast response,and low limit of detection(63 ppb).The excellent sensor performances are attributed to the enhanced adsorption of oxidative oxygen species due to the presence of abundant oxygen vacancies.The scalable fabrication of WO_(3) thin film gas sensors and the oxygen vacancy engi-neering strategy proposed herein may shed some light to developing high performance environmental sensors.