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Keywords
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Chemical control, Early control, Late control, Pistachio psyllid,
Thiamethoxam
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Abstract
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The pistachio psyllid, Agonoscena pistaciae Burckhardt &
Lauterer, is one of the most destructive pests of pistachio trees in Iran. This
study evaluated the efficacy of five chemical compounds including abamectin
(EC 1.8%), acetamiprid (SP 20%), hexaflumuron (EC 10%), hexaflumuron
(EC 10%) + abamectin (EC 1.8%), and thiamethoxam (SC 24%) at
concentrations of 0.6 ml/L, 0.25 g/L, 0.7 ml/L, 0.5 + 0.3 ml/L, and 0.4 ml/L,
respectively. The insecticides were applied at two different timings: early
control (second week of May) and late control (fourth week of June) in two
pistachio orchards in Isfahan Province, Iran. Nymphal mortality was recorded
one day before spraying and at 3, 7, 14, and 21 days post-treatment. In both
application times, thiamethoxam and abamectin exhibited the highest and
lowest insecticidal efficacy, respectively. The early control was more efficient
than the late control in all treatments. Therefore, early application of
thiamethoxam is recommended for optimal chemical control of pistachio
psyllid.
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