Received: 29-11-2019
Accepted: 31-01-2020
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Influencesof Host Plants on the Biology of Two-Spotted Spider Mite Tetranychus urticaeKoch (Acari: Tetranychidae)
,
Nguyen Duc Tung
2
Keywords
Two-spotted spider mite, Tetranychus urticaeKoch, intrinsic rate of increase, life table
Abstract
Tetranychus urticaeKoch (Acari:Tetranychidae) is a dangerous peston manycropsin Vietnam and worldwide. The objective of this study wasto find outthe biological and ecological characteristics of this harmful two-spotted spider miteas a basis to launch the effective pest managing strategies in the future. In this study, the development time, reproduction and population growth of two-spotted spider mite reared on the green bean variety TN38 and cucumber F1 (VA.103) were investigated at 23.5C. Results showed that the total immatures of male T. urticaewere not significantly different when reared onthebean and cucumberfor11.93 days and 11.73 days, respectively. However, the life cycle of female T. urticaereared on bean (13.69 days)wassignificantly shorter than its rearingon the cucumber (15.65 days). The oviposition rate and total number of eggs laid by the females fed on the bean (6.00 eggs/female/day and 62.69 eggs/female, respectively) were significantly higher than that of the female fed on cucumbers (3.13 eggs/ female/day and 29.35 eggs/female, respectively). The generation time (T) of the two spotted spider mite reared on bean (17.72 days)was significantly shorter than that on cucumbers (19.98 days). The net reproductive rate (R0) of the female fed on bean (45.02 females/female) was much higher than that of females reared on cucumbers (21.97 females/female). The intrinsic rate of natural increase of T. urticaeon bean was 0.210 which showed asignificantly higher than in cucumber (0.150).
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