| Banana flower thrips Thrips hawaiiensis(Morgan), is a significant insect pest and occurred commonly in banana orchards. It can cause damage to banana production. This test studied some biological of this pest, including life stages, developmental threshold temperature, effective accumulated temperature, Survival rates of different stages, longevity of female, reproductive capacity, the procreation table of experimental population. And researched some efficient methods(e.g. effects of volatile compounds, The toxicity determination of6insecticides) to control Thrips hawaiiensis(Morgan).We drew some conclusions thruogh studying in laborary. As followed:1、Thrips hawaiiensis (Morgan) was tested at five contest temperature (14℃、18℃、22℃、26℃and30℃) in the laborary to investigate the development periods of their different development stages, survival rates of different stages, longevity of female, reproductive capacity and calculate their development threshold temperature, effective accumulated temperature, innate capacity of increase(rm), net reproduction rate(R0), average generation period(T), finite rate of natural (λ) and time for doubling population increase(t). The results showed that the development period of different development stages shortened with the temperature increasement, the relationship between temperature and development speed of each life stage fitted with liner model. The period of Thrips hawaiiensis (Morgan)’s adult was28.54d,15.51d,11.97d,10.61d,6.19d respectively; The development start temperature of Whole generation was8.69℃. The effective accumulative temperature of whole generation was153.81d·℃. The Generation survival rate at25℃was high, being63.16%, while at30℃was lower, only46.34%. Under the14-30℃, the average longevity of femal adults was58.17d,33.00d、28.67d、22.33d、18.67d respectively. The highest intrinsic rate of natural increase (rm)0.208, net reproduction rate (R0)142.7210and finite rate of natural increase (λ)1.5425was observed at26℃. While the lowest intrinsic rate of natural increase (rm)0.1753was observed at14℃.22-26℃is suitable temperature condition for the growth of them.2、The responses of walking adult female Thrips hawaiiensis (Morgan), to volatile compounds at several concentrations were investigated in a Y-shaped glass tube olfactometer. The results showed that:Thrips hawaiiensis (Morgan) were attracted by nerol, geraniol,β-Citronellal of monoterpene, as well as methyl anthranilate of benzenoids and ethyl nicotinate of nicotinate. The best effect among them was nerol which at10%of concentration. Then is ethyl nicotinate and methyl anthranilate at10%of concentration. However, all these volatiles were attractive at a specific concentration. attraction was not at higher or lower concentrations. The Selectivity of Thrips hawaiiensis to nerol, ethyl nicotinate, methyl anthranilate and β-Citronellal of10%which banana flowers used as control showed that nerol at10%concentration has the potential to control Thrips hawaiiensis in field. Thrips hawaiiensis can be recorded by using nerol as a lure for monitoring.3、In order to select more effective insecticides and guide insecticide application in field, toxicities of6kinds of insecticides to nymph of Thrips hawaiiensis (Morgan) were determined by residual film with centrifuge tube method. The results showed that, after the treatment of24h, the LC50of emamectin-benzoate, beta-cypermethrin, abamectin, monosultap, imidacloprid, buprofezin on nymph was1.96,2.36,5.42,8.99,66.08,152.8mg·L-1respectively. The reduction sequences of toxicities of6kinds of insecticides to nymph of Thrips hawaiiensis (Morgan) is emamectin-benzoate> beta-cypermethrin> abamectin> monosultap> imidacloprid> buprofezin. Therefore, emamectin-benzoate, beta-cypermethrin, abamectin ang monosultap of6kinds of insecticides on the Thrips hawaiiensis had a better control effect. |
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