Sweet Corn
European corn borer (ECB) catches continue to be extremely low, and no map will appear in this edition. Feeding in NJ sweet corn plantings is highly variable, but with second and third plantings now reaching the silk stage, we find that later plantings have much less damage. Check 5 plants each in 10 random locations for a 50 plant sample. Look for “shot-hole” injury, and consider treating when the number of infested plants in a 50 plant sample exceeds 12%. As infested plants proceed to the pre-tassel stage, live larvae and damage may be found in the emerging tassels. Once plants hit full tassel, ECB larvae will move downward on the stalk and re-enter the plant near the area where ears are forming. This can result in direct injury to the ear. Growers should consider an insecticide application at the full tassel stage to target ECB larvae as they migrate downward. This application can eliminate larvae that have escaped any earlier insecticide applications. [Read more…]
Vegetable Crops Edition
Seasonal updates and alerts on insects, diseases, and weeds impacting vegetable crops. New Jersey Commercial Vegetable Production Recommendations updates between annual publication issues are included.
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Veg IPM Update: Week Ending 7/05/17
Cucurbit Downy Mildew ALERT – 7/3/17
Cucurbit downy mildew was confirmed on cucumber in southern New Jersey (Cumberland County) today. This is the second report of CDM in New Jersey this growing season. All cucumber growers in NJ are encouraged to add downy mildew specific fungicides to their weekly maintenance spray programs. All growers should scout cucumber plantings as well as all other cucurbit crops for symptoms. CDM has also been reported on cucumber in MD, DE, and PA. To track the progress of cucurbit downy mildew in the US through the CDMpipe website through NCSU please click here.
Vegetable Disease Update – 6/28/17
- Bacterial leaf spot has been reported in pepper and cucumber.
- Cucurbit downy mildew has been confirmed on cucumber in New Jersey.
- Basil downy mildew has been reported in central New Jersey.
- There have been no new reports of Late blight on tomato or potato in the past week.
Cucurbit Downy Mildew ALERT – 6/28/17
Cucurbit downy mildew was confirmed on cucumber in southern New Jersey (Salem County) today. This is the first report of CDM in New Jersey this growing season. All cucumber growers are encouraged to add downy mildew specific fungicides to their weekly maintenance spray programs. All growers should scout cucumber plantings as well as all other cucurbit crops for symptoms. CDM was reported late last week in on cucumber in Maryland (Dorchester County). To track the progress of cucurbit downy mildew in the US through the CDMpipe website through NCSU please click here.
Veg IPM Update: Week Ending 6/28/17
Sweet Corn
European corn borer (ECB) catches have dropped to nearly nothing, and no map will appear in this edition. Feeding in NJ sweet corn plantings is highly variable, with some plantings exceeding 40%, but these occurrences are generally where there were higher moth catches during the first flight. Feeding overall is lower than expected for the first generation. Check 5 plants each in 10 random locations for a 50 plant sample. Look for “shot-hole” injury, and consider treating when the number of infested plants in a 50 plant sample exceeds 12%. As infested plants proceed to the pre-tassel stage, live larvae and damage may be found in the emerging tassels. Once plants hit full tassel, ECB larvae will move downward on the stalk and re-enter the plant near the area where ears are forming. This can result in direct injury to the ear. Growers should consider an insecticide application at the full tassel stage to target ECB larvae as they migrate downward. This application can eliminate larvae that have escaped any earlier insecticide applications. [Read more…]
Veg IPM Update: Week Ending 6/21/17
Sweet Corn
European corn borer (ECB) catches remain low generally, with a few remaining hot spots in southern Hunterdon County and on the Cumberland-Salem border (see ECB map). Feeding in NJ sweet corn plantings has risen, with some plantings exceeding 40%. Check 5 plants each in 10 random locations for a 50 plant sample. Look for “shot-hole” injury, and consider treating when the number of infested plants in a 50 plant sample exceeds 12%. As infested plants proceed to the pre-tassel stage, live larvae and damage may be found in the emerging tassels (see bottom photo at right). Once plants hit full tassel, ECB larvae will move downward on the stalk and re-enter the plant near the area where ears are forming. This can result in direct injury to the ear. Growers should consider an insecticide application at the full tassel stage to target ECB larvae as they migrate downward. This application can eliminate larvae that have escaped
any earlier insecticide applications. [Read more…]
