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Biology of Bemisia tabaci (Genn.) B biotype (Hemiptera, Aleyrodidae) on tomato genotypes

DOI: 10.1590/S0103-90162011000100006

Keywords: insecta, whitefly, antibiosis, antixenosis.

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Abstract:

brazil is one of the main tomato (solanum lycopersicum) producers worldwide. nevertheless, considerable part of the production is lost due to bemisia tabaci (genn.) b biotype attacks. resistant plants can be an important method for controlling this pest in an integrated pest management. tests for evaluating some biological aspects of b. tabaci were carried out on 18 tomato genotypes, in controlled laboratory greenhouse conditions. thirty-day-old plants placed in plastic cages were infested with 20 whitefly pairs each, for 24 h. the development of at least 30 eggs in three leaflets per plant (repetition) was observed until adult emergence. the development period of insects grown in la1335, pi365928 and la722 genotypes took three days longer when compared to the ones grown in pi134418 (20.3 days). the highest mortality rate of whitefly nymphs occurred in pi365928, la1335 and la722 genotypes (63.8, 54.5 and 53.3%, respectively), and the smallest ones in iac294 and iac68f-22-2 genotypes (4.9 e 6.2%, respectively). la1335, pi365928 and la722 genotypes presented moderate feeding nonpreference and/or antibiosis-based resistance to b. tabaci b biotype.

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