EFFECTS OF THE FUNGICIDES MANCOZEB AND DITHIANON ON MORTALITY AND REPRODUCTION OF THE PREDATORY MITE AMBLYSEIUS-ANDERSONI

被引:27
作者
IORIATTI, C
PASQUALINI, E
TONIOLLI, A
机构
[1] Istituto Agrario Provinciale, S. Michele all'Adige (TN), S. Michele a/A (TN), 38010, v. E. March
[2] Istituto di Entomologia, Universita' di Bologna, Bologna
关键词
D O I
10.1007/BF01275521
中图分类号
Q96 [昆虫学];
学科分类号
摘要
Laboratory studies using commercial formulations of mancozeb and dithianon at concentrations equivalent to recommended field rates of 200 and 80 g/hl, respectively, were conducted to evaluate toxic effects of these fungicides on the predatory mite Amblyseius andersoni Chant. In short-term tests where females were placed on apple-leaf disks and sprayed with mancozeb, no mortality of adults was observed; however, there was a 34% decrease in fecundity, a 7.1% decrease in egg hatch, and mortality of larvae and protonymphs was 6.7%. In long-term tests, a significant reduction in fecundity was also observed. A decrease in hatch that was dependent on age at time of treatment was found when eggs were treated directly with mancozeb. No effects on mite mortality or reproduction were observed in short-term tests with dithianon. These results suggest that dithianon might be considered as a potential alternative to mancozeb for scab control.
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页码:109 / 116
页数:8
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