Population growth and survival of western flower thrips Frankliniella occidentalis Pergande (Thysanoptera, Thripidae) on different chrysanthemum cultivars. Two methods for measuring resistance.
1993
Jager C.M. de | Butot R.P.T. | Jong T.J. de | Klinkhamer P.G.L. | Meijden E. van der
Two methods were used to measure the resistance of 5 chrysanthemum cultivars to thrips Frankliniella occidentalis Pergande (Thysanoptera, Thripidae). As a measure of resistance of a cultivar, growth and survival of the insect population were taken. First, leaf cages were used to look at the survival of thrips larvae on a single leaf. The survival of thrips larvae differed significantly between cultivars. After 3 weeks only 14% of the thrips survived on the most susceptible cultivar and over the entire period only 16% became adults. On the most resistant cultivar all larvae died before becoming adult. Second, thrips population growth was studied on whole plants with and without flowers in cages. After 4 weeks the cultivar differed significantly in thrips numbers in both experiments. Twenty to sixty times as many thrips were found on plants with flowers as on plants without flowers. For the plants with flowers the number of flowers explained 44.6% of the variance in thrips numbers, whereas cultivar explained 10.5%. When corrected for the number of flowers, these results bore a striking resemblance to the differences in susceptibility found in the experiment with plants without flowers. Similar rank orders were found for the 5 cultivars with respect to resistance with the leaf cage experiment, the whole-plant cage experiment without flowers and the whole-plant cage experiment with flowers, after correction for the number of flowers. Both methods are useful in the evaluation of thrips resistance.
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
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تم تزويد هذا السجل من قبل Wolters Kluwer