Shonga et al
Greener Journal of Agricultural Sciences Vol. 3 (6), pp. 518-527, June 2013.
Manuscript Number: 061213667
Effect of Insecticide Rotation and Mixtures Use for Resistance Management on Cotton Aphid, Aphis gossypii Glover (Hemiptera, Aphididae) in Middle Awash Areas of Ethiopia
Ermias Shonga.,1* Kemal Ali.2 and Ferdu Azrefegne.3
1Entomologiest, Hawassa Agricultural Research center. 2Entomologist; Holeta Agicultural Research Center, Ethiopian Institute of Agricultural Research (EIAR). 3Entomologist, Hawassa University College of Agriculture (HU), Po Box 06, Hawassa, Ethiopia.
*Corresponding Author‘s Email: ermishon @ yahoo. com
A field experiment was conducted at Werer Agricultural
Research Center, Afar region, Ethiopia, to determine the
best insecticide rotation sequence and use of compatible
mixtures in the Insecticide Resistance Management strategy
for cotton aphid, Aphis gossypii. Randomized Complete Block
design having eight treatment combinations and four
replications were used. The parameter assessed were aphid
population at pre and post insecticide application; and seed
cotton yield. In this experiment, four round of spray
application was made by using insecticides from different
chemical class and their mixtures. Using the modified
Abbott’s formula, the percent efficacy was computed. A
highly significant difference (P< 0.001) was observed among
the treatments for post spray counts. In most of the
treatments made during the first round spray, the aphid
population didn’t show a response to the insecticides
applied. But starting the second round, the insecticides
were able to express their potential in reducing aphid
population. In most cases sole treatments were better than
mixtures. However, the mixtures like endosulfan +
carbosulfan and endosulfan + furathiocarb gave better
control of aphid. As the effect of insecticide rotation,
treatment 2 (Carbosulfan, Diafenthiuron, Furathiocarb and
Deltamethrin), 3 (Dimethoate, Carbosulfan, Deltamethrin and
Diafenthiuron) and 5 (Endosulfan, Endosulfan + Carbosulfan,
Deltamethrin and Dimethoate) were the best alternative
combinations of insecticide groups to be used in IRM
strategy. Seed cotton yield was significantly different (P<
0.0001) among treatments. The highest seed cotton yield
(29.84 q/ha) was recorded from treatment 5 (Endosulfan,
Endosulfan* Carbosulfan, Deltamethrin and Dimethoate),
followed by treatment 1(Endosulfan, Carbosulfan,
Deltamethrin and Furathiocarb) and 7 (Furathiocarb
Endosulfan * Furathiocarb, Deltamethrin and Dimethoate) and
yielding 26.29 and 20.47 q/ha, respectively. These findings
point to the fact that, alternative use of insecticides from
different class and using insecticide mititures is the best
option to manage insecticides resistance in cotton aphid.
Keywords: Cotton aphid (Aphis gossypii), insecticide resistance management, Ethiopia.
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