Nature of development of angular leaf spot on cucumber in the field.
Susceptibility to Pseudomonas lachrymans was lowest in seedlings. Infection rose sharply from the appearance of true leaves. Spread of the disease from plant to plant was greater than disease development itself from the appearance of true leaves to mid-flowering. Disease development began slowing down during flowering and was very slight during fruiting. In the lab. bacteria multiplied faster on young leaves and in 4 days there were 100 times as many as on old ones.