پديد آورندگان :
اشتري، صديقه دانشگاه تهران پرديس كشاورزي و منابع طبيعي - گروه گياهپزشكي , صباحي، قدرت اله دانشگاه تهران پرديس كشاورزي و منابع طبيعي - گروه گياهپزشكي , طالبي جهرمي، خليل دانشگاه تهران پرديس كشاورزي و منابع طبيعي - گروه گياهپزشكي
كليدواژه :
آبامكتين , استاميپريد , امامكتين بنزوات , فلوبندياميد , مديريت تلفيقي آفت‌ها
چكيده لاتين :
Tomato leaf miner, Tuta absoluta (Meyrick) (Lep.: Gelechiidae), is one of the most important pests of tomato in the
world. In the current study, effects of four insecticides, abamectin, emamectin benzoate, acetamiprid, and
flubendiamide were tested against 1st larval instar and pupae of the tomato leaf miner. Also, their lethal effects were
studied on the adult stage of two species of egg parasitoids, i.e., Trichogramma brassicae and T. evanescens. The leaf
miner collected from greenhouses near Arak (Markazi province, Iran) were reared for three generations under
laboratory conditions and then treated by the leaf-dip method at larval or pupal stages. The parasitoids were tested by
coated vial residue method. Insect mortality was recorded 24 h after initial exposure. The LC50 values of abamectin,
emamectin benzoate, acetamiprid, and flubendiamide were 0.92, 0.13, 1.51, and 0.34 µg/ml, respectively for the 1st
larval instar and 4.99, 2.25, 3.22, and 3.48 µg/ml, respectively for the pupae. Similarly, the LC50 values of the abovementioned compounds were 0.0013, 0.0029, 0.0058, and 1.53 µg/ml, respectively for T. brassicae and 0.0014,
0.0025, 0.0052, and 1.71 µg/ml, respectively for T. evanescens. The maximum number of parasitized eggs was seen
on the 2nd day after the emergence of both parasitoids. These amounts for T. brassicae after treatment by LC25 of
flubendiamide, acetamiprid, emamectin, and abamectin, were 14.70 ± 0.17, 14.00 ± 0.20, 13.1 ± 0.20, and 11.8 ±
0.14, respectively which statistically differed with the control (16.00 ± 0.12). For T. evanescens, the related values
were 13.10 ± 0.21, 12.37 ± 0.12, 11.50 ± 0.18, and 11.23 ± 0.16, respectively which differed meaningfully from the
control (14.00 ± 0.19). Risk quotient categorized flubendiamide in class 2 (slightly harmful) and other compounds in
class 3 (harmful). Based on our results, flubendiamide showed selectivity and it can be used as an effective tool for
integrated pest management programs of tomato leaf miner.
