Abstract
The two-spotted spider mite, Tetranychus urticae Koch, is a cosmopolitan mite. It reproduces very rapidly and can also develop resistance to chemicals easily. This paper describes our effort in testing, in laboratory and field, the efficacy of some common miticides against the two-spotted spider mites on chrysanthemum, roses and strawberry. Among the 22 pesticides and 5 non-pesticidal materials tested, the following had good effect (＞90% mortality) against the eggs, larvae, nymphs and adults of this mite on chrysanthemum: 42% Dicofol E.C. (800-fold), 57% Propargite E.C. (2000-fold), 38% Dienochlor F. (1500-fold), 25% Oxythioquinox W.P. (500-fold) and 20% Pyranica W.P. (2000-fold). In addition, 25% Oxydemeton methyl E.C. (1000-fold), 2.8% Bifenthrin E.C. (1000-fold) and 25% Azocyclotin E.P. (1500-fold) were also effective. Effective against the two-spotted spider mites on roses were 57% Propargite E.C. (2000-fold), 25% Oxythioquinox W.P. (500-fold), 2.8% Bifenthrin E.C.(1000-fold), 50% Formetanate S.P.(1000-fold) and Action Research (1000-fold). They produced ＞90% control of nymphs and larvae of this spider mite on roses; their ovicidal activity was somewhat less. Besides, 25% Azocylcotin W.P.(1500-fold) and 10% Hexythiazox W.P. (4000-fold) were also effective. To the eggs, nymphs and adults of the two-spotted spider mites on strawberry, 5% Fenpyroximate F. (1000-fold) and 2% Abamectin E.C. (2000-fold) had excellent control effect. These two compounds, when officially recommended, could be used safely on strawberry for the control of this spider mite. For the control of the two-spotted spider mites on watermelon, 2% Abamectin E.C. (2000-fold) and organic fertilizer Iou-lih No.2 (250-fold) gave 100% and 93.5% control, respectively. The above results showed that most miticides currently used on chrysanthemum, rose and strawberry remain quite effective against the two-spotted spider mites. With proper timing and a rotational application of these pesticides, the two-spotted spider mites can be put under control.
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