Document Type : Original Article
Authors
1
Department of Agricultural Entomology Research, Iranian Research Institute of Plant Protection, Yaman Avenue, Chamran Highway, Tehran, Iran
2
Bam Agricultural Research Center, Research Center of Agriculture and Natural Resource, Kerman Province, Iran.
3
Department of Pesticide Research, Iranian Research Institute of Plant Protection, Yaman Avenue, Chamran Highway, Tehran, Iran
4
Karaj Plant Protection Laboratory, Iranian Research Institute of Plant Protection, Yaman Avenue, Chamran Highway, Tehran, Iran
Abstract
Dubas bug, Ommatissus lybicus, is one of
the key pests of date palmsin Iran. Chemical
control is the most conventional control method of this dangerous pest. The aim
of this investigation was to compare efficacy, advantages and disadvantages of
drenching, and foliage spraying of chemical control. The study was conducted in
a Randomized Complete Block Design with 10 treatments and 3 replications
(trees) in a completely infested date palm grove. Treatments included
imidacloprid SC350 (Confidor®) and thiamethoxam WG250 (Actara®) by foliar spraying
(4 g/tree) and by drenching method (10, 20, 80, and 100 g/tree), diazinon EC600
(40 ml/tree) as recommended insecticide by foliar spraying and then the check
(without treatment). The nymph population and number of honeydew drops were
recorded one day before and 7, 14, and 120 days after treatment. Insecticide
residue of date palm and cost-benefit ratio were calculated. The results showed
that all foliage application treatments had more efficacy compared to drenching
treatments at 1 and 2 weeks after spraying but at 120 days after drenching, thiamethoxam
(80 g/L) and imidacloprid (100 g/L) had 100% efficacy, while the efficacies of
thiamethoxam, imidacloprid, and diazinon foliar spraying was zero. The residue
of date fruit treated by high doses of drenching was not detectable. The
highest cost-benefit ratio belongs to imidacloprid foliage spraying (24.86)
followed by imidacloprid drenching (15.67). The lowest ratio belongs to
thiamethoxam drenching (3.12). Comparison of different concentrations of
neonicotinoid drenching revealed that high concentration of thiamethoxam and
imidacloprid was more than two times effective.
Keywords
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