Occurrence of Lepidosaphes cupressi on red bayberry plants in greenhouse and control effect of four insecticides
Red bayberry in Lanxi is a geographical indication product of agricultural products of the Ministry of Agriculture and Rural Affairs.With the popularity of greenhouse,Lepidosaphes cupressi was as a major scale and its occurrence showed an increasing trend.Occurrence rules and control techniques of L.cupressi in greenhouses and open fields were studied by monitoring and investigation in main production areas of red bayberry in Lanxi,Zhejiang.Monitoring results show that L.cupressi had two generations a year in greenhouse and open fields,respectively,and the population had two peaks in the growth season.The peak period of L.cupressi in greenhouses was from middle March to late March,about one and a half months earlier than that in the open fields.Different towns and different cultivation methods had significant effects on the population of L.cupressi,the average number of L.cupressi per leaf in greenhouses in the four towns was five times that in open fields.Among them,the red bayberry in Majian town was the most seriously affected by L.cupressi.Pesticide experiments demonstrated that spirotetramat·dinotefuran 20％SC 2 000-fold dilution showed the best control efficacy of 90.5％and 94.4％15 and 30 days after application,respectively,and the efficacy of spirotetramat·dinotefuran 20％SC 2 500-fold dilution,spirotetramat·dinotefuran 20％SC 3 000-fold dilution,mineral oil 95％EC 50-fold dilution,sodium pimaric acid 20％SP 200-fold dilution were more than 85％30 days after application,significantly better than that of buprofezin 65％WP 2 500-fold dilution.Thus,it is suggested that fruit farmers should choose mineral oil or sodium pimaric acid for control during the peak period of eggs hatching.At present,spirotetramat·dinotefuran has not been registered yet in red bayberry.After further test and registration,it can be promoted and applied in practical production.
red bayberry in greenhouseLepidosaphes cupressioccurrence rulescontrol technology
万方数据
维普
