EFFICIENCY OF SPINETORAM AS A BIOPESTICIDE TO ONION THRIPS (THRIPS TABACI LINDEMAN) AND GREEN PEACH APHID (MYZUS PERSICAE SULZER) UNDER LABORATORY AND FIELD CONDITIONS

Spinetoram toxicity was evaluated under laboratory conditions against primary stages and adult of onion thrips, Thrips tabaci Lindeman and green peach aphid, Myzus persicae Sulzer. Seventy two hours after treatment, lethal concentrations LC10, LC20,LC50 and LC90 for onion thrips adults were 3.171, 5.439, 15.370 and 74.490 µg/ml, respectively, while they were 18.043, 26.782, 57.304 and 181.991 µg/ml for larvae. Under the same conditions, they were 2.993, 4.882, 12.520 and 52.368 µg/ml for peach aphid adults and 5.431, 8.371, 19.264 and 68.335 µg/ml for nymphs, respectively. Thus, the adult stage of both insects was more susceptible to spinetoram than primary stages and the toxicity slope was steepest for adults and flattest for primary stages. Field bioassays were also carried out under a greenhouse conditions and apricot trees. Spinetoram was sprayed at the rates of 37.5, 75, 150, 300 and 400 µg/ml and these doses caused reduction of infestations of both insects.