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Control of major insect pests on cut chrysanthemum flowers by gamma radiation



Control of major insect pests on cut chrysanthemum flowers by gamma radiation



Plant Protection Bulletin (Taichung) 28(2): 139-146



Gamma radiation has been tested for the control of major insect pests on cut chrysanthemum flowers for export purpose. The results are summarized as follows: (1) At dosages of over 100 krad, the leaves of irradiated chrysanthemums turned to blight a week after treatment. (2) At 20 to 60 krad, leaves became chloratic and wilting within two weeks. Besides, the higher the dosage, the faster the symptoms developed. Yet at 20 krad, no damage was noted and the blossoming was prolonged. (3) The sensitivities of cultivars to .gamma.-radiation were different. At 30 krad, for instance, white-flowered cultivars were so sensitive that they became wilt at the 7th day after treatment, whereas red and yellow ones wilted at the 13th and the 14th day, respectively, (4) Radiation treatment might prevent the water absorption and transportation of chrysanthemums, thus causing symptoms of chlorosis and wilt which, however, could be inhibited by adding perservatives to dipping water before and after irradiation. The adding of perservatives could also prolong the duration of blossoming. (5) Mortal dosages varied with chrysanthemum insects. Caterpillars of corn earworms, for instance, were effectively killed at 20 to 30 krad, while aphids, mites and thrips were killed at 60 krad. Among the latter 3 pests, aphids had the highest mortality, mites the next, and thrips the lowest. In conclusion, the dosages of 20 to 60 krad supplemented by preservatives were effective in the control of insect pests without damaging chrysanthemums.

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