Analysis of Factors Affecting the Sex Pheromone Trapping of the Tomato Leafminer Tuta absoluta(Meyrick)Moths
The damage in the tomato crop caused by the tomato leafminer Tuta absoluta(Meyrick)can be devastating.Monitoring by sex pheromone trapping or control by mass trapping is one of the means of detection and control of pests.Extraction,identification and analysis of sex pheromones of female T.absoluta moths and their ratios from Xishuangbanna(Yunnan),Xichang(Sichuan),Chifeng(Inner Mongolia)and Shenyang(Liaoning)were employed in the study.In field experiments,we compared and analyzed the effects of some major factors related to sex pheromone trapping on the trapping efficacy.The results showed that there is no significant difference in the composition of the sex pheromone of the tomato leafminer at four sites in China.The main components were composed of(E,Z,Z)-3,8,11-tetradecatrienyl acetate(E3,Z8,Z11-14:Ac)and(E,Z)-3,8-tetradecadienyl acetate(E3Z8-14:Ac).The results showed that the purity and dosage of the sex pheromone compound E3Z8Z11-14:Ac are closely related to the number of moths attracted.The number of moths attracted by pheromone compound with 93%purity was 2.48 times that of 82%.The optimal dosage for Polyvinyl chloride(PVC)capillary as matrix was 900―1200 μg per lure.The wing-type sticky traps attracted twice as many moths as the diamond sticky traps.The best trap was the wing-type sticky trap with a green cover,and the distance between the cover and the sticky plate was 6―9 cm.The optimal height of trap setting was o cm,when the trap was placed on the soil level.As the height increased,the number of moths caught decreased.When the trap was placed higher than 120 cm,no moths were trapped.There was no difference in the location of the traps in the tomato greenhouse.These results will help improve the field application of sex pheromone trapping for monitroing and controlling the tomato leafminers.
Tuta absolutasex pheromonedosagetrapfactors associated with pheromone trapping
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