Journal of Taiwan Agricultural Research

Author:Hsiou-Hua Hao

Abstract:

    Cultivation of sweet pepper under net house may significantly block the access of many large size insect pests to the plants, yet the small ones would occur severely in the net house when rainfall is rare. This study was conducted to investigate the effect of cultivation practices on the occurrence of pest types of sweet pepper and to screen out chemicals and synthetic substances for controlling these pests. Results showed that aphid, thrip, mealy bug, spider mite and broad mite were found both inside and outside net house and in the open-feld where sweet pepper were grown, but were prevailing inside the net house. Whereas, spiraling white fy, tomato leaf miner and big moth occurred only in the open-feld. By the use of mixed synthetic substances to control broad mite, it indicated that mineral oil and soapberry to mix with sunfower oil or wood vinegar obtained a substantial control effect, with the control rates of 59.7%, 49.4% and 48.7%, respectively. Of the fve mixed synthetic substances, the control rate reached more than 80% on kanzawa spider mite by using sulfur power, mineral oil, soapberry in sunfower oil and neem oil. Among four tested acaricides, 1,500× milbemectin 1% EC (emulsifable concentrate) had the highest control rate (89.3%) for broad mite, followed by 2,000× abamectin 2% EC (86.9%). For the control of spider mites, 4,000× etoxazole 10% SC (suspension concentrate) and 1,500× milbemectin 1% EC (98.4%) were equally effective. As to the control of southern yellow thrip, the synthetic substance using wood vinegar mixed with mineral oil had better efficacy (76.4%) than that mixed with sunflower oil (72.8). To control mealybug, 3,000× dinotefuran 20% SG (water-soluble granules) and 3,000× movento 9.65% SC were the better choices among pesticides, with the control rate higher than 77%. It was 500× diatom powder that had the best effcacy among the mixed synthetic substances for mealybug control.

Key words:Sweet pepper, Pest, Control, Non-pesticide substances, Pesticide

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