Population fluctuation of cottonwhitefly, Bemisiatabaci (Gennadius) on certain tomato hybrids at Sohag region

Document Type : Research and Review Papers

Authors

1 Plant protection Department Faculty of Agriculture Sohag University Sohag Egypt 82524

2 Plant Protection research Institute Agricultural Research Center El-Dukki Giza Egypt

3 Sohag Univ.

Abstract

The population trend of B. tabaci adults and nymphs on tomato
crop in winter plantation in terms of weekly mean numbers/ 10
leaves during the study period (2018/2019 and 2019/2020
seasons), The adults of whitefly started to take place from the
first week of inspection, then the population increased to form
three peaks of activity in both seasons. However, for the
nymphs, the population started to appear on tomato leaves in the
second week of inspection in both seasons, then increased to
form two and one peaks in the two seasons, respectively. Also,
data showed that the susceptibility of seven tomato hybrids to
infestation by B. tabaci adults and nymphs, respectively, during
two successive seasons 2018/2019 and 2019/2020.For adults,
Hybrid Lugen appeared as moderately resistant (MR) in both
seasons, also, Hybrid Super red, Hybrid 102, Hybrid 449
showed Low resistance (LR) to B. tabaci, adults While, Hybrid
65010, Hybrid 83 and Hybrid 039 appeared as susceptible (S) in
both seasons. Also, for nymphs, it is clear differences between
the tested hybrids were significant during the two seasons.
Hybrid Super red, Hybrid 102,HybridLugen and Hybrid 449
showed Low resistance (LR) to B. tabaci nymphs during the
both seasons While, Hybrid 65010, and Hybrid 039 appeared as
susceptible (S) in both seasons.

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