Mechanism Of Withered Black Populus Leaves Attract Helicoverpa Armigera Moths And Screening Of Attractant

This paper does research on the mechanism of attracting insects of withered black poplar leaves conducted both in laboratory and in the field, and the main results are as follows.Volatiles from withered leaves of black poplar, .Assaying the withered black populars leaves of three months with two ways. It shows that steam distillation (extracted by and dichloromethane)losed some low-grade esters and fusel oil compare with the gas adsorption.but it can get more components which is solide under normal temperature and also can condense the aromas.Two obvious trends as follow:Along with the months'successive, the content of aromas is increasing gradually,while the content of GLVs is declining. But the salicylal are very sumptuous all the time.Electroantennograms(EAGs) were recorded from male and female moths of Helicoverpa armigera in response to key volatiles isolated and identified from the volitales of withered leaves of black poplar.The aroma whose lateral has 1~2 carbon chain and the GLVs elicit the strong response.The mated female moths elicit stronger response to benzyal and salicylal than the moths unmated.Tested the attractant with a columniform olfactory with single stimulating sourse made of glass invented by us.lt turned out that the green leaf odor and some aromas can attract the moths.There weren't differences in the response of male> female and mated moths.Maybe that the moth will appeal to general GLVs if there is not any plant in the cage tested.Populus-branch-bundles can also attract male moths without the female moth's participant.Field -test showed that the GLVs can not attract the moths and can not improve the effect of other aromas.The aroma comes from the lignose and are general in the nature. And they can attract many kinds of moths especially the Noctuidae,we use the best carrier , solvent,antiseptic and antioxidant as the assitant ingredients,screened out the preferable attractant named "P"which can be used in the crops field,its main pest-target is Helicoverpa armigera, etal.The cotton bollworms incline to the poplar bundles on there two flying pinnale,but mating and ovipositing of moths needs derivation of stated darkness,additionally that the amount of male and female allured by the odor has not nottable difference.We consider that the odor of withered black poplar can seduce the moths to eat. Thfc keystone of using poplar bundles in the cotton field is that the host of adults and larve are different.Many male moths have also the same volatiles as the leaves in their hair-brushes.They can lure both sexes and come from the selectivity-store of the larva's host or the pollens the moths suck.The signal of eating and mating are the same.We should design attractant of moths with odors come from the adult hosts ,use it in the field where they oviposit ,and that is to say ,the larvas' hosts.