Abstract
The objective of our study was to compare the effects of electron beam irradiation on the development and reproduction of Tetranychus urticae strains that were susceptible or resistant to acequinocyl, bifenazate, and etoxazole. Electron beam irradiation (50–400 Gy) was applied to T. urticae eggs, nymphs, and adults, after which the hatching rate, the emergence rate, longevity, and fecundity were analyzed. Eggs of all the T. urticae strains were irradiated with 150 Gy, and none of them hatched. When protonymphs were irradiated with 300 Gy, oviposition and thus F1 hatchability in newly emerged adults were completely suppressed. The F1 hatching rate of irradiated adults began to markedly decrease with a dose of 200 Gy, and all strains experienced 100% inhibition at a dose of 400 Gy. Sodium dodecyl sulfate polyacrylamide gel electrophoresis (Sodium dodecyl sulfate polyacrylamide gel electrophoresis) showed substantial reductions in the levels of a 50 kDa protein in the susceptible and three resistant strains of T. urticae after irradiation with 400 Gy. These results indicate that a dose of 400 Gy was required to inhibit the normal development and reproduction of T. urticae, and susceptible and acaricide-resistant strains of T. urticae had identical radiosensitivities.
Highlights
The two-spotted spider mite, Tetranychus urticae, is known as a major pest that causes economic loss in agriculture and floriculture in Korea, and worldwide, because it has a short life cycle and develops rapid resistance to acaricides [1,2,3]
The susceptibility of T. urticae adult females to acequinocyl, bifenazate, and etoxazole was evaluated in the S, AR, BR, and ER strains (Table 1)
We investigated the effect of electron beam irradiation on the changes in protein synthesis of adults of the S and resistant strains of T. urticae
Summary
The two-spotted spider mite, Tetranychus urticae, is known as a major pest that causes economic loss in agriculture and floriculture in Korea, and worldwide, because it has a short life cycle and develops rapid resistance to acaricides [1,2,3]. Ionizing radiation has become one of the most common quarantine treatments for insect pests, and it includes gamma-ray, X-ray, and electron beam radiation. Electron beams and X-rays consist of electromagnetic radiation, ionizing radiation, and photons with energies similar to those of gamma rays. These ionizing radiations produce free radicals in cells when they interact with atoms or molecules.
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