Effects of Irradiation on Plant Growth and Some Pests Incidence In: Cotton and Kidney Beans

Abstract

The effects of low doses of gamma irradiation on cotton, Gossypium barbadence kidney beans, Phasolus vulgaris were investigated. Seeds for each crop were irradiated with 4 doses of gamma radiation, 15, 25, 35 and 45 Kilo rad for cotton and 5, 10, 20 and 30 Kilo rad for kidney beans. Plants of the two crops were used to determine growth parameter. Since, kidney beans plants were negatively affected in the most of its growth parameter as a result of gamma radiation, and cotton plants were highly affected and clearly activated, therefore, the effects of gamma radiation on phenolic compounds and plant tolerance to pests were took place on cotton plants only. Increasing radiation dose obtained increase in number of phenolic compounds; eight different phenolic plants were detected in irradiated cotton plants. Feeding Spodoptera littoralis (Boisd.) larvae on irradiated cotton leaf, induced larval mortality with 100, 100, 73.3 and 85 % for the 15, 25, 35 and 45 Kilo rad treatments, respectively, compared with 20% for the larvae feed on control plants. On the other hand, irradiated cotton plants attract aphids compared with its abundance on control plants.

Effect of Different Doses of Gamma Irradiation on Biology and Life Table of Tetranychus urticae Koch (Acari: Tetranychidae) of Two Ornaments Plants

“…Many researchers observed that gamma irradiation causes significant changes in pest biology concerning reproduction; irradiation at low irradiation doses eliminated most Alternaria, Fusarium, leafhopper, cotton leaf worm and two-spotted spider mite (Megali, 1987;Hussein et al, 1999;Ramakrishna et al, 1991;Abdu El-Nour and Ibrahim, 2006and Hussein et al, 2005and 2007.…”