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Phloem necrosis of potato tubers associated with infestation of vines by Paratrioza cockerelli Sulc

Phloem necrosis of potato tubers associated with infestation of vines by Paratrioza cockerelli Sulc

Sci Agric Ottawa 32(8): 433-439

An intense tuber phloem necrosis and associated vine symptoms developed in about 10 days as a result of nymphs and adults of P. cockerelli feeding on apparently healthy potato vines in open field culture during July and Aug. The causal agent is apparently a toxic substance injd. into the plant by the insect while feeding, which soon becomes systemic. Apparently it is not a virus plants from affected tubers are merely weak in the 1st season and normal in the next tuber generation. The sudden appearance of tuber phloem necrosis in Alberta in 1938 may have been due to a genetic mutation in the local psyllid population. Further positive evidence that the causal agent can be transferred to healthy plants by grafting technic is required.

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