ORIGINAL ARTICLE
Effects of azadirachtin, cypermethrin, methoxyfenozide and pyridalil on functional response of Habrobracon hebetor Say (Hym.: Braconidae)
1
Department of Plant Protection, College of Agriculture, University of Maragheh
Maragheh, 55181-83111,
Iran
2
Department of Plant Protection, College of Agriculture, Azarbaijan University of Tarbiat Moallem
5375171379, East-Azarbaijan, Tabriz, Iran
Corresponding author
Moosa Saber
Department of Plant Protection, College of Agriculture, University of Maragheh Maragheh, 55181-83111, Iran
Department of Plant Protection, College of Agriculture, University of Maragheh Maragheh, 55181-83111, Iran
Journal of Plant Protection Research 2012;52(3):353-358
KEYWORDS
TOPICS
ABSTRACT
Habrobracon hebetor
Say is one of the most important natural enemies of the
Helicoverpa armigera
Hübner (Lep.: Noctuidae)
.
In this study, the sublethal effects of LC
30
concentration of azadirachtin, cypermethrin, methoxyfenozide and pyridalil on the functional response of
H. hebetor
to different densities of 5th instars larvae of
Ephestia
kuehniella
Zeller were
evaluated. Young females were
exposed to LC
30
of the insecticides for an appropriate time of exposure. Then, six randomly selected alive females were transferred
individually to plastic Petri dishes (10 cm in diameter) and supplied with the following densities: 2, 4, 8, 16, 32 and 64 of 5th instars
of
E
.
kuehniella
for 24 h. Eight replicates were considered for each insecticide treatment and the control. The results revealed a type
II functional response in the control, and all of the insecticide treatments. This study showed that the control and the cypermethrin
treatment had the shortest (0.4143 h) and longest (0.624 h) handling time, respectively. The highest (0.0035 per hour) and lowest
(0.0029 per hour) attack rate was observed in pyridalil and cypermethrin treatments, respectively. Based on values of handling time,
cypermethrin had the highest adverse effect on host-finding in
H. hebetor
.
CONFLICT OF INTEREST
The authors have declared that no conflict of interests exist.
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