| Lygus lucorum has made serious damage to fruit trees and cotton crops in the basin of the Yangtze River and the Yellow River Valley. It has wide range of the host plants, transferring host to complete its life cycle. To study the host transfer rules can provides an important basis for reasonable control strategy. At present, it is not fully clear about the host transferring of orchards. Although, the results has shown in the north of the orchards, as the eatable young tissue reduced, the second generation of Lygus lucorum from overwintering host transfer to the weed around the orchards at the middle of June. However, before the middle of June, if the first generation of Lygus lucorum can move back and forth between around trees and weeds to feed? We do not understand about it, the answer to the question to the master field diffusion rules of Lygus lucorum in the orchards and the use it on the host preference for prevention and control has very important meaning. For this purpose, we conducted the main fruit trees and weeds in host feeding choice behavior of Lygus lucorum, to clear it on the feeding preferences and analysis the phenomenon of transferring diffusion in the orchards and the weeds around.This study:(1) first of all, the thorn attracts potential device was improved, by comparing image acquisition in Lygus lucorum behavior and EPG waveform, determining the EPG waveform and its meaning of Lygus lucorum on the main host, establishing the method of host feeding behaviors of Lygus lucorum using EPG.(2) The tropism to fruits host and humulus(the main weeds of Lygus lucorum) were compared by using Y-tuber olfactometer. The feeding behaviour to different hosts of Lygus lucorum were compared by EPG waveform analysis on fruit trees and weeds of Lygus lucorum. The feeding point number of Lygus lucorum in different fruit trees host were compared by free feeding choice selection on fruit trees and weeds. The comprehensive evaluation of host preference of Lygus lucorum to the main fruit trees and weeds were made according to the smell choice, the feeding behaviour and choices to fruit host and the weeds.The main conclusions:(1) Five feeding behavior (spying, insertion, piercing, smoking, pull) and six non-feeding behavior (crawling, search tentative, still adjusting, cleaning, escape) of Lygus lucorum were identified and described. The EPG waveforms of Lygus lucorum feeding behaviour were defined, NP-wave, T-wave, P-wave, D wave and I wave.(2) The tropism and feeding choices of Lygus lucorum on six host plants were clarified. Lygus lucorum had a strong tropism on apple, jujube, humulus, grapes, walnuts, but peach becoming weaker. The tropism of Lygus lucorum on apple is higher than on humulus, the tropism on other fruits trees had no difference with humulus, or even lower than humulus. Olfactory effects will attract female Lygus lucorum to strong lure plants, but feeding does not depend on the eventual role of olfaction. Lygus lucorum usually choose more fruit trees than humulus, but there is no significant difference between peach and humulus.Corollary:Lygus lucorum preferred feeding on fruit trees rather than humulus in the presence of enough young fruit tissue. Meanwhile, there are big differences between different trends to fruit smells and palatability of Lygus lucorum. For example, in apple orchards, green bugs prefer feeding on apple young organization rather than humulus. In peach orchards, Lygus lucorum might migrate between peach and humulus. Based on the above analysis, we should make control strategies to Lygus lucorum depending on the trend to different fruit trees and hobbies... |
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