The combined effect of some plant extracts and pesticide Pymetrozine and two tomato varieties on biological characteristics of Bemisia tabaci (Homoptera: Aleyrodidae) in greenhouse conditions

Bemisia tabaci (Homoptera: Aleyrodidae) is one of critical pests in Iran. Developing alternative methods instead of chemical compounds is essential in pest management for the sake of human health and environmental protection. The effect of two plants extracts Fumaria parviflora (Fumariaceae) and Teucrium polium L. (Lamiaceae) and Pymetrozine pesticide on some bio-parameters of B. tabaci in two cultivars of tomato compared. The results proved that the effect of the two plants extracts and the pesticide on bio-parameters of B. tabaci is significant in level 1% in comparison to the control plant. Applying Pymetrozine on tomato Cal-jn(3) cultivar resulted in the premature longest growth period (27.84 days) while the shortest was in the control treatment of tomato Ergon cultivar (26.20 days). The highest loss rate of all immaturity stages of B. tabaci through applying Pymetrozine obtained from Ergon cultivar (91.62) and the least rate from control treatment of Ergon cultivar (26.04).