Development fitness of Bemisia tabaci B-biotypefeeding on different host plants
Author of the article:
Author's Workplace：
Key Words：Bemisia tabaci B-biotype,host plant,survival,development,sex ratio
Abstract： To reveal the impacts of host plants on the development and fitness of Bemisia tabaci B-biotype,survivorship curves,development rates and the adult sex ratio of B.tabaci populations on tomato,cotton,bean and pepper crops were compared under laboratory conditions.The results show that the survival rate of B.tabaci from egg to adult differed significantly on different host plants.Survival rates on different host plants could be ranked from highest to lowest as follows;tomato=cotton>bean>pepper.The developmental period from eggs to 50% adult eclosion was 25.5 d,23.0 d,22.8 d and 22.5 d on pepper,cotton,bean and tomato crops respectively.The proportion of adult females differed significantly among host plants;pepper (63.0%)>cotton (58.3%)>bean (52.0%)>tomato (49.7%).Compared with the first generation on tomato crops,the survival rate of the second generation was significantly higher,the developmental rate was accelerated,and the proportion of adult females was also significantly higher.In contrast,the survival,development and proportion of adult females of B.tabaci raised on cotton did not differ between the first two generations.This indicates that the development and fitness of B.tabaci B－biotype differs on different host plants.The observation that survival of B.tabaci on pepper was lowest but the proportion of adult females was the highest indicates that this insect can adjust its offspring sex ratio.