Abstract
This research aims to study the virulence of five isolates of Beauveria bassiana to eggs and nymphs of Bemisia tabaci on tomato. In the experiment eggs and second instar nymphs of B. Tabaci were used. Five isolates of the fungus, i.e., WS, TD312, PD114, PA221, PB211, were tested. Conidial concentration of B. bassiana used were 108 conidia/ml. Experimental parameters included mortality of eggs and nymph and percentage of adult emergence. The results showed that all B. bassiana isolates tested were able to kill B. tabaci eggs but with very low mortality (2-19%). Mortality of second instar B. tabaci nymphs was dependent on the fungal isolates. Isolate WS had the highest virulence, which caused 70% mortality of 2nd instar nymphs, with a LT50 of 4.87 days. Nymphs of B. tabaci were highly susceptible to B. bassiana infection compared with eggs. B. bassiana applicated to nymphs of B. tabaci can decrease the percentage of adult emergence.
Highlights
Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) is one of the main pests in tomato plants.[1]
Eggs Mortality Results of the virulence test of five B. bassiana isolates against B. tabaci eggs showed that all tested isolates kill B. tabaci eggs, but with very low mortality
Low mortality of B. tabaci eggs after the fungal application is thought to be caused by the eggshell of B. tabaci which has a specific layer that can prevent the conidial tube from penetrating to the inside of the egg
Summary
Bemisia tabaci Gennadius (Hemiptera: Aleyrodidae) is one of the main pests in tomato plants.[1]. The reproduction and spread of these pests are very fast, in a year, is able to produc till 15 generations.[9]
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