Angular leaf spot

Watermelon Scab Belly rot Angular leaf spot Nematodes... 

Cucurbits (cucumbers, melons) anthracnose mosaic angular leaf spot Colletotrichum lagenarium virus Pseudomonas lachrymans 42,43,54 1 10... 

While biotic sensitization of plants against pathogens may act systemically, not all organs or tissues are necessarily protected equally. Recent work in our laboratory has shown that the extent of resistance against anthracnose or angular leaf spot of leaves in different positions on immunized cucumber plants varies in a complex manner not necessarily directly proportional to proximity of the inducer lesions (73). Removal of epidermal layers from immunized cucumber leaves reduces resistance to anthracnose (74). 

Water-soaked spots that turn gray, die, and drop out leaving shotholes are caused by angular leaf spot or by scab. Angular leaf spot causes small, brown, angular spots on fruit. Scab-damaged fruit develops sunken, brown spots with a sticky ooze. Scab is worse in cool. moist weather. Fancipak , Score , and Slice-master are resistant to scab. 

Fruit with spots flesh may rot. Causes Angular leaf spot Alternaria blight black rot scab other fungal or bacterial diseases. See "Leaves with spots, blotches, or brown areas on page 85 for controls. 

Fruit with brown, sunken spots on the surbce. Cause Bacterial leaf spot. Brown or black angular leaf spots may also appear. This disease isn t curable, although copper spray offers partial control. Resistant cultivars include AU-Amber , Crimson , and Simon . For more information and control measures, see Fruit with small, dark, sunken spots or cracks on skin on page 166. 

Leaves with spots, blotches, or brown areas. Causes Powdery mildew angular leaf spot scab Alternaria leaf blight other fungal and bacterial diseases. Various diseases attack squash. Reduce problems by keeping foliage dry when watering and by not touching plants when wet. Spray infected plants with a dilute solution of copper spray to reduce the spread of the disease. 

Ana.sa Irislis. See Squash hugs Anemone. 17-18 Anemone blanda, 17, 18 Anemone coronaria. 17, 18 Aneihum graveolens. 92 Angular leaf spot... 

Bacterial leaf spot causes small, angular black spots on leaves. Leaves may turn yellow and drop early. Spray lime-sulfur every 10-21 days until leaf drop if weather is wet or humid, or if the spots are spreading. 

Symptoms Downy mildew infections begin as angular yellow spots on the upper leaf surfaces these spots eventually turn brown. Corresponding white, tan, or gray, cottony spots form on the undersides of the leaves. Downy mildew can also attack young shoots and fruit, forming a white coating. 

Small yellowish areas between leaf veins, later fuming to buff-coloured angular, sunken spots (speckled yellows) which eventually coalesce. 

NATURE OF DAMAGE. Light-green, watery, angular spots initially on the underside of the leaf. Subsequently spots also become visible on the top of the leaf and turn black. Bacterial mucus is secreted on the underside of the leaf. 

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