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Angular Leaf Spot -  HOSTS: Cucurbits (cucumber, squash), a similar strain
infects beans. DESCRIPTION:
This is
a bacterial disease causing dark, angular spots between leaf veins;
tear shaped droplets ooze from infected tissue. As the leaf dries, leaf tissue tears and shrinks. Fruit may exhibit circular spots
or rotted areas. LIFE
CYCLE: The
bacteria over winters in plant debris and can persist for more than two
years on dry leaves. It enters the plant through wounds or natural
openings under wet conditions, then can be spread mechanically. Angular
leaf spot is also seed borne (treat seed for 20 minutes with 120°F.
water). CONTROLS:
Use 2 year
rotations between cucurbit crops. Avoid wetting foliage with irrigation
water. Use resistant cultivars when possible. Plant on raised beds. Copper
can be sprayed to protect leaves when weather is wet and
warm. Excessive nitrogen fertilizer increases disease severity. |
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