The infection of apples by Phytophthora syringae |
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Authors: | K L EDNEY |
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Institution: | East Mailing Research Station, Maidstone, Kent, ME 19 6BJ |
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Abstract: | Contamination with infected soil has led to high wastage of apples in storage due to rotting by Phytophthora syringae. At 3-3 oC lesions formed 3–4 wk after inoculation with zoospores; the percentage infection fell if the suspensions dried after 48 h at this temperature and after 22 h at 15 oC. Infected soil rotted fruit only if kept moist; at 3-3 oC a 3-day period of wetness resulted in 37-5% rotting after 8 wk. Fruit dipped in soil slurry remained wet in some parts of a 4361(12 bushel) bin for at least 3 wk. There was a 10-fold increase in rotting by contact between sound and rotting fruit after 11 wk at 3-3 oC. Captan gave effective protection against rotting derived from zoospores or infected soil; it had no eradicant action. |
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