Gummy stem blight of watermelon Gummy stem blight...Tebuconazole fungicide for powdery mildew, gummy...
Transcript of Gummy stem blight of watermelon Gummy stem blight...Tebuconazole fungicide for powdery mildew, gummy...
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Diseases of Cucurbits
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Gummy stem blightGummy stem blight of watermelon
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Gummy stem blight of watermelon
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Gummy stem blight of muskmelon
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Gummy stem blight of muskmelon
Fungal structures-sign.
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Didymella bryoniae, causal agent of gummy stem, blight on stem.
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Didymella bryoniae conidia released in columns from pycnidia.
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Gummy stem blight management•Crop rotation ~3 years•Fall tillage•Field/greenhouse sanitation•Timely fungicide applications
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anthracnose of watermelon
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anthracnose of muskmelon
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anthracnose of cucumber
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Anthracnose management•Crop rotation ~3 years•Fall tillage•Field/greenhouse sanitation•Timely fungicide applications
anthracnose of watermelon
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Bacterial Fruit Blotch
Bacterial fruit blotch management•Crop rotation ~2 years•Fall tillage•Field/greenhouse sanitation•Timely fixed copper applications
Bacterial fruit blotch of watermelon
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Fusarium wilt of watermelon
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Vascular discoloration
Fusarium wilt of watermelon/fungal
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Alternaria leaf blight of muskmelon
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Alternaria leaf blight of muskmelon
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Alternaria leaf blight of muskmelon
Alternaria leaf blight management•Crop rotation ~2 years•Fall tillage•Timely fungicide applications
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Powdery mildew of cucumber
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Movement in plantActive ingredient On
surface (contact)
Limitedmovement(systemic)
Primary uses
chlorothalonil X Many fungal diseasesmancozeb X Many fungal diseasescopperhydroxide/sulfate
X Limited use on fungaldiseases
captan X Many fungal diseasessulfur X Powdery mildew, mitesazoxystrobin X Leaf spot diseasesmyclobutanil X Powdery mildewpyraclostrobin X Leaf spot, rust diseasestebuconazole X Leaf spot diseasespropaconazole X Leaf spot, rust diseases
Comparison of several fungicide active ingredients
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Follow the label including:• Wear protective clothes
like gloves• Use the correct rate• Make sure crop is on the
label• Wash hands before
eating.
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Bacterial wilt of muskmelon
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Streaming or oozing with cut stemscaused by bacterial wilt.
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Bacterial wilt of muskmelon
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Bacterial streaming
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Diseases of pumpkin
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Powdery mildew of pumpkin
Healthy variegated pumpkin leaves
Powdery mildew management•Crop rotation ~2 years•Fall tillage•Partial resistance•Timely systemic fungicide applications
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Virus diseases of pumpkin
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Virus diseases of pumpkin
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Virus diseases of pumpkin
Virus disease management•Aphid transmitted•Insecticides ineffective against virus spread•Planting date
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Downy mildew-pumpkin
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Downy mildew-pumpkin
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Downy mildew-pumpkin
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Downy mildew-pumpkin
Downy mildew management•Scout fields•Follow epidemic•Timely use of specialized systemic fungicides
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Phytophthora blight of pumpkin
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Phytophthora blight of watermelon
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Cucumber culls withPhytophthora blight
Phytophthora blight may arrive oncrop culls
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Phytophthora blight
Phytophthora blight management•Crop rotation >4 years•Water management•Field sanitation•Specialized fungicides
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Bacterial spot pumpkin
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Bacterial spot pumpkin
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Bacterial spot pumpkin
Bacterial fruit spot management•Crop rotation ~3 years•Fall tillage•Monitor seed source•Weed management•Field/greenhouse sanitation•Timely fixed copper applications
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Root knot nematode•Many hosts, melons, pumpkins, tomato
Root knot nematode•Avoid field with high populations of RKN•Brassica cover crops may help•Fumigants may be used
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Fungicide applications for melons
•Is it for you?•Know the disease/product•Safety•Measure carefully•Anticipate the disease•Be ready to repeat
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Start fungicide applications before disease appears
Lesions of Septoria leaf spot on tomato
Disease lesions start to small to see.
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Insects are visible or not.
Scout for insects pests—then apply insecticides
Cornell
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Muskmelon/Watermelon fungicide schedule
May June July August
Mancozeb fungicide (contact) for gummy stem blight & anthracnose
Tebuconazole fungicide for powdery mildew, gummy stem blight & anthracnose
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