12. Control of Fruit Blotch Prevention Avoid introduction of bacterium (pathogen-free seed) Inspection of seedlings and destroy suspicious flats Decontaminate if contact is made with infected plants Chemical Streptomycin (illegal, not labeled) is used in dire situations in the greenhouse to stop the spread of the pathogen Muhammad Asif Pakistan
13. Control of Fruit Blotch In the field: Culls and plant debris should be plowed under Rotate to new areas away from contaminated fields Choose less susceptible varieties Those with light green rinds = more susceptible Light and dark green striped= more resistant Solid dark green varieties are most resistant Bacterium moved by wind-driven rain or by mechanical means. Avoid contaminated fields when wet. Copper-based fungicides can reduce incidence of fruit symptoms. Muhammad Asif Pakistan
28. Anthracnose of cucurbits (watermelon) Sunken lesions with pink/salmon colored sporulation Muhammad Asif Pakistan
29. Disease Cycle Pathogen persists in crop debris, seedborne and may survive on volunteer plants or cucurbit weeds Conidia are the main means of in-field spread and are dispersed by watersplash and wind blown rain. Muhammad Asif Pakistan
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31. Control Fungicides Apply approved fungicides to the crop at regular intervals, more often if frequent rains occur. Among fungicides available are chlorothalonil (Bravo), benomyl (Benlate), and maneb and mancozeb formulations. An effective spray treatment has been the combination of Bravo with Benlate or mancozeb. If angular leaf spot should be a problem, substitute a copper compound for Benlate in the combination. Muhammad Asif Pakistan
Bacterial fruit blotch Caused by Acidovorax avenae subsp. citrulli Infected seedling
Bacterial fruit blotch Caused by Acidovorax avenae subsp. citrulli
Bacterial wilt of melon Caused by Erwinia tracheiphila
Bacterial wilt of melon Caused by Erwinia tracheiphila Note: Sticky strand test on cut stems with bacterial slime streaming from xylem tissues
Striped cucumber beetle Acalymma vittatum Adult and larvae
Anthracnose on cucurbits Caused by Colletotrichum orbiculare
Anthracnose on watermelon Caused by Colletotrichum orbiculare
This disease of cucurbits is caused by two powdery mildew fungi; Sphaerotheca fuliginea and Erysiphe cichoracearum . While fruit infection is possible, the greatest damage comes from decimation of the leaves leaving the fruit exposed for sunscald and decreasing the surface area available for photosynthesis. The end result is decreased quantity and quality of yield.
Powdery mildew Caused by Sphaerotheca fulginae and Erysiphe cichoracearum Fungal growth on both surfaces of the leaves
This is a close-up of a leaf showing the white fungal mycelium and spores that have covered the entire leaf surface.
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