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Test of Insecticidal Efficacy of Some Commercial Natural Products against Trialeurodes vaporariorum (Homoptera: Aleyrodidae), Bemisia tabaci (Homoptera: Aleyrodidae), and Spodoptera litura (Lepidoptera: Noctuidae)
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/291224
whitefly, Bemisia tabaci (Gennadius) have a wide host range including cucumber, tomato, and pepper, resulting in loss of crop yield. In this study, we tested larvicidal efficacy of several on-the-market environment–friendly agricultural materials (EFAM) to select the effective products after the target pests were stabilized in indoor rearing condition. The developmental periods of two whiteflies are as follows: in the case of T. vaporariorum, egg duration is 9.6 days, and nymph is 18.9 days, and in the case of B.tabaci, egg durationis 7.4 days, and nymph is 15.2 days under 25℃ with relative humidity (RH) of 60±5% and a photoperiod of 16L : 8D. The total period of T. vaporariorum as 5 days longer than B. tabaci. Among 22 EFAMs six products showed more than 60% of insecticide efficacy for against T. vaporariorum BTVB, BTVD, BTVG, BTVL, BTVM, and BTVS. On the other hand, seven EFAM products including showed over 60% of insecticide efficacy against B. tabaci BTVD, BTVG, BTVK, BTVL, BTVM, BTVN, and BTVU. In the case of Spodptera litura previously, xxEFAMs were tesed against 2nd instar S.litura, and EFAMs were found to have more than 90% efficacy. Test of these six EFAMs against entire larval stages were performed in this study. Although some of these products showed still more than 90% of insecticidal efficacy against up to 3rd instar larvae, the efficacy of these EFAMs sharply decreased as ages increase, result is less than 60% of efficacy of the products at most. This result indicates the difficulty to control S. litura with the on-the-market EFAMs alone under economic injury level. Collectively, it is required to find more EFAMs and find alternative method to control those insect pests tested in this study.
