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it showed lower toxicity (mortality – 48.9%) 31 days after treatment in 2006. Sp<strong>ir</strong>odiclofen<br />
240 g l -1 , 96.0 g AI ha -1 was rated as very toxic to fruit tree red spider mite<br />
2, 7 and 31 days after treatment.<br />
Discussion. Meteorological conditions for fruit tree red spider mite were favorable<br />
in 2005 and medium favorable in 2006. High a<strong>ir</strong> temperature and dry weather<br />
resulted higher infestation of apple trees by mites in 2005. Leaf samples collected<br />
from untreated plots showed an abundance of fruit tree red spider mites and its<br />
distribution during the season. All rates of Abamectin 18 g l -1 were rated as very<br />
toxic to fruit tree red spider mite 2–5 and 7 days after treatment. Similar results were<br />
demonstrated in Canada (Hardman et al., 2003). Meanwhile Abamectin 18 g l -1 showed<br />
lower toxicity in 2006. It have been reported, that the toxic effects of pesticides<br />
to mites depend on the chemistry of pesticides, the<strong>ir</strong> rates, microclimatic conditions<br />
and the development stages of the mites (Edland, 1994; Auger et al, 2003; Bostanian<br />
et al., 2004; Martînez-Villar et al., 2005). The toxicity of Abamectin was compared<br />
with the toxicity of Lambdacihalotrin and Sp<strong>ir</strong>odiclofen to fruit tree red spider mite.<br />
Sp<strong>ir</strong>odiclofen 240 g l -1 , 96.0 g AI ha -1 was rated as very toxic 2–5, 7 and 31 days<br />
after treatment and showed long term of action. Similar toxicity patterns of different<br />
rates of Sp<strong>ir</strong>odiclofen to strawberry and two spotted spider mites were recorded in<br />
strawberries (Raudonis et al., 2005; Raudonis, 2006). Lambdacihalotrin 50 g l -1 ,<br />
<strong>25</strong>.0 g AI ha -1 was very toxic 2–5 and 7 days, but from non-toxic to moderately<br />
toxic 31 days after treatment. The lower term of action of Lambdacihalotrin was<br />
reported in other crops and mites (Raudonis 2005 et al., Raudonis, 2006).<br />
Conclusions. 1. Abamectin 18 g l -1 , 27 g AI ha -1 and Abamectin 18 g l -1 , 18 g AI<br />
ha -1 were rated as very toxic (mortality ranged from 92.9 to 99.0%) to fruit tree red<br />
spider mite (Panonychus ulmi Koch) 2-5 and 7 days and from moderately to very<br />
toxic (mortality – 54.4–89.7%) 31 days after treatment.<br />
2. Abamectin 18 g l -1 , 13.5 g AI ha -1 was very toxic (mortality – 89.0–91.4%) 2–<br />
5 and 7 and only moderately toxic (mortality – 51.1–62.4%) 31 days after treatment.<br />
3. Sp<strong>ir</strong>odiclofen 240 g l -1 , 96.0 g AI ha -1 was rated as very toxic 2–5, 7 and 31<br />
days after treatment and showed long term of action, meanwhile Lambdacihalotrin<br />
50 g l -1 , <strong>25</strong>.0 g AI ha -1 was very toxic 2–5 and 7 days after treatment, but from nontoxic<br />
to moderately toxic 31 days after treatment.<br />
Gauta 2006-11-15<br />
Parengta spausdinti 2006-12-11<br />
References<br />
1. Auger P., Guichou S., Kreiter S. Variations in acaricidal effect of wettable sulfur on<br />
Tetranychus urticae (Acari: Tetranychidae): effect of temperature, humidity and life stage //<br />
Pest Management Science. 2003. 59(5). P. 559–565.<br />
2. Bostanian N. J., Vincent C., Hareman J. M., Larocque N. Toxicity of indoxacarb to<br />
two species of predacious mites and a predacious M<strong>ir</strong>id // Pest Management Science.<br />
2004. 60(5). P. 483–486.<br />
3. Choi W., Lee S. G., Park H. M., Ahn Y. J. Toxicity of Plant Essential Oils to Tetranychus<br />
urticae (Acari: Tetranychidae) and Phytoseiulus persimilis (Acari: Phytoseiidae) //<br />
Journal of Economic Entomology. 2003. 97(2). P. 553–558.<br />
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