| Rice leaf roller,Cnaphalocrocis medinalis is one of the most important pest in Jiangsu Province.In recent years,the population dynamics of C.medinalis has also changed due to the change of climate,traditional cropping system and other factors.In this paper,the occurrence and dynamics of C.medinalis in Dafeng District of Yancheng City were investigated.At the same time,the green control technology of C.medinalis was studied by using high-efficiency,low toxicity,low residue chlorantraniliprole and other chemicals,artificial release Trichogramma and different application tools.The main results are as follows:1.After five years of light trapping,systematic investigation and field investigation,the main migration period of C.medinalis in Dafeng district was in the first and middle of July,and six(4)generations of C.medinalis gradually became the main pest.For the six(4)generations of rice leaf roller,it is necessary to control the moth peak period,egg hatching peak period and low age larva peak period,which can effectively reduce the use of chemical pesticides.At the same time,the main reasons for the change of the quantity of C.medinalis in Dafeng District in recent years are analyzed,that is,the suitable climate conditions are conducive to its reproduction,the growth period of rice is delayed,the food conditions are rich,which aggravates the occurrence and damage of rice in the later period,and the poor quality of medicine makes the rice leaf roller aggravate the damage2.Chlorantraniliprole,metaflumizone,emamectin benzoate,the mixture of emamectin benzoate and indoxacarb present a good leaf protection and pest control ability.While,we found the leaf protection and pest control effect of the mixture of avermectin and chlorpyrifos,the mixture of avermectin and hydrazine is poor,because the toxicity of the mixture of avermectin and chlorpyrifos is high and the effect of mixture of avermectin and hydrazine is relatively slow.This two insecticides will be replaced by novel insecticides under serious occurrence of C.medinalis.From those above results,we proposed that the preferential application of chlorantraniliprole,indoxacarb to conduct chemical control during egg hatching peak period to young larvae,due to their highly effective and low-toxic feature.In the key period,the above application can benefit to control the number of adults and older nymphs,restrict the mass reproduction of C.medinalis,and reduce the losses and damage3.The artificial release of Trichogramma can reduce leaf curling rate,but the control effect is not good,so it cannot completely replace the pesticide control.It is suggested that the control effect of Trichogramma releasing combined with chemical agent is better than that of chemicals.4.The control effect of insecticides on C.medinalis was less affected by the kinds of pesticide equipment.The self propelled boom sprayer and multi rotor unmanned plant protection machine have high efficiency per capita,good efficiency of machine tools,and saving the number of workers.It is more suitable for large-scale planting because of its time-saving,labor-saving and practical application.From the perspective of application control effect,the control effect of several pesticide equipment is ideal.The use of additives can improve the utilization rate of pesticides and reduce the use amount of pesticides. |
