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Reduced volume application of fungicides for the control of onion rots |
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| Authors: | A Grinstein Y Elad Naomi Temkin-Gorodeiski Yehudith Rivan H Frankel |
| Institution: | 1. Lab. of Pesticide Application Research, ARO, The Volcani Center, 50250, Bet Dagan, Israel 2. Dept. of Plant Pathology, ARO, The Volcani Center, 50250, Bet Dagan, Israel 3. Dept. of Fruit and Vegetable Storage, ARO, The Volcani Center, 50250, Bet Dagan, Israel |
| Abstract: | A survey was conducted to define the fungi population contaminating onion bulbs in Israel during three growing seasons. Significant rots were found to be caused byBotrytis allii, B. cinerea andAspergillus niger. All the onion stocks tested showed infections, but the severity and identity of the pathogens varied between seasons.B. cinerea andB. allii were the most prevalent fungi in winter-harvested onions. Species ofAspergillus, Penicillium, Fusarium, Rhizopus andTrichoderma were also isolated. The first two were the only species found on summer onions. High fungal contamination had been the main factor affecting an attempt to improve the storage quality and shelf life of the harvested bulbs. Chemical disinfection using a reduced-volume application (RVA) technique was efficient in controlling the major storage rots (caused byA. niger andB. cinerea) of the bulbs, without the major disadvantages of the dipping method. The rate of control was directly correlated with the cover density of the deposited fungicide, but not with the amount deposited. The RVA technique should enable prolongation of postharvest shelf life and storability of onion bulbs. |
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