Observation And Study On The Oviposition Behavior Of Peach Fruit Borer(Carposina Sasakii Matsumura)

Peach fruit borer(Carposina sasakii Matsumura)belongs to Lepidoptera Carposinidae.It is found in many provinces in China,peach fruit moth is the most dangerous and most popular fruit borer pest in our country north area.The bored fruit rate is over 50%in part of the apple orchards,in some areas the chemical cost used for preventing peach fruit borer accounts for all the cost's 20%?25%.The damage of peach fruit borer is main factor to limit the fruit yield and quality,affecting fruit commodity value and export.In recent years,bagging technology makes Carposina sasakii Matsumura control to a certain extent,but the harm to the tree which it is difficult to achieve bagging technology is increasing.At the same time,because bagging technology contraries to the law of plant growth,affects the flavor of the fruit and increases the cost of the economy,the application of bagging technology in developed countries is relatively small,fruit "no bag" has become a global trend at present.The peach fruit borers oviposit on the fruit calyx,and the larvae infects fruits.Oviposition period is the key period to prevention.A comprehensive grasp of Carposina sasakii Matsumura oviposition patterns and analyzing the mechanism of oviposition can lay the foundation for peach fruit borer comprehensive prevention and treatment programs.The experiment content is divided into three parts as follows:In the first part,the infrared night vision technology was used to set up a simple indoor observation device,we observed the Carposina sasakii Matsumura night oviposition,shot its complete oviposition process,and summarized oviposition patterns.Experiment results showed:(1)The process of peach fruit borer oviposition behavior is summarized in four steps as follows:search,probe,oviposition and pectination.(2)The peach fruit borer makes oviposition judgement based on real-time light,not just based on the endogenous rhythms.(3)The oviposition frequency distribution percentage is positively correlated with the oviposition time distribution percentage.The use of infrared night vision technology makes it possible for us to observe the peach fruit borer at day and night,surpassing the capacity constraints of naked eyes,cost effectively,and the image data can be stored.We can thoroughly grasp the mating and oviposition regular patterns and behaviors of other nocturnal insects using the application of infrared night vision technology.In the second part,based on the complete ommateum and light guiding mechanism of peach fruit borer like other nocturnal insects,as well as the results about phototactic possibility of peach fruit borer indoor and outdoor,We set different wavelengths of LED light source and different colors of oviposition surface conditions in order to observe the oviposition amounts,initial and termination dates of oviposition,The daily average oviposition trends of Carposina sasakii Matsmura.Experiment results showed:(1)In the conditions of different wavelengths of LED light source and same color of oviposition surface,the oviposition amounts are not significant difference(P>0.05),the initial and termination dates of oviposition are also not significant difference(P>0.05),The daily average oviposition trends are convergence.(2)In the conditions of same wavelength of LED light source and different color of oviposition surface,the oviposition amounts are not significant difference(P>0.05),the initial and termination dates of oviposition are also not significant difference(P>0.05),The daily average oviposition trends are convergence.The tests proved:The wavelengths of LED light source and colors of oviposition surface are not the critical factors in peach fruit borer oviposition selection.In the third part,the ultrastructures of sensilla on pseudovipositor of the peach fruit borer were observed by scanning electron microscopy(SEM).Scanning electron microscopy results showed that sensilla were of seven types:sensilla trichodea,sensilla chaetica,sensilla basiconica,Bohm bristles,sensilla mammilliformia,Bud-shaped sensilla,and smell pore.These sensilla play a variety of functions in the Carposina sasakii Matsmura oviposition process.There are many sensilla trichodea and sensilla chaetica at the end of the peach fruit borer abdomen.In the surface of the oviposition contact detection,mechanical sensilla like sensilla trichodea,sensilla chaetica,and Bohm bristles play a key role.The chemical analysis process is initially guided by the antenna,it is judged by sensilla trichodea sensilla basiconica and sensilla mammilliformia ultimately.The most suitable oviposition environment of the peach fruit borer is medium temperature and high humidity,this is closely related to the roles of sensilla basiconica and sensilla mammilliformia on the pseudovipositor.