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Biological parameters of the onion thrips, Thrips tabaci Lindeman were studied on the following onion (Allium cepa L.) cultivars: Nasik Red Plus N-53, Onion Dr-301 (Krishna), Onion White, and Nasik Red, at 25±1oC and 65±5% RH. Signifi cant (p < 0.05) diff erences were found in the life stages and fertility life tables on diff erent cultivars except in the pupal stages. More information about the biological parameters of T. tabaci on onion cultivars can help in designing Integrated Pest Management programs for onion thrips.
The density of thrips (Thysanoptera) population on ten hybrid cultivars of carrot was estimated in the field experiment in 2011–2012. The influence of Thrips tabaci Lind. feeding on yielding of carrot was studied in the insulator experiments. Changes in the content of soluble sugars, sucrose and total carotenoids in roots of plants infested by thrips in relation to the control plants were also determined. In both seasons the most numerous species of thrips was T. tabaci (47.7% of all caught thrips). The cultivar most often inhabited by thrips was Deep Purple F1 – the carrot having a purple tinge of root and dark-green leaves. The feeding of thrips almost always causes a reduction in marketable yield of roots. However, the plants infested by T. tabaci were characterized by an increase of soluble sugars and sucrose content in roots. Decrease or increase in total carotenoids content in roots was depended on carrot cultivar.
The wettable powder was prepared on the basis of aerial conidia of two isolates of the entomopathognic fungus, Beauveria bassiana. Viability and pathogenicity of conidia products were evaluated against the second-instar larva of Thrips tabaci in four cases; Conidial-product Maintained in Refrigerator (CMR), Conidial-product Maintained in Laboratory (CML), New Formulated Conidia (NFC) and New Conidia without formulation (NC). Analysis of corrected seven-day total mortality data revealed that there were significant differences among these product-cases in their pathogenicity to thrips larvae. Recorded mortality rates for CMR, CML, NFC and NC showed that the pathogenicity of CML was lower compared to three other cases for both isolates. In the next step, inorganic salts (MgCl2, NH4PO4, KH2PO4, MgSO4 and NaCl) were added at a rate of 0.1 M into the both CMR and CML products. Bioassay results indicated that caused total mortality of thrips larvae increased with adding of salts. Our results showed that applied carriers and salts have positively effected preserving of conidia viability and pathogenicity to the second-instar larva of the onion thrips.
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