- Cucurbit downy mildew has been confirmed on cucumber in New Jersey. To date, cucurbit downy mildew has been reported on cucumber and melon in the mid-Atlantic region. Downy mildew is beginning to be reported on many other cucurbits in other parts of the country. All cucumber growers need to add a downy mildew-specific fungicide to their weekly fungicide programs. All cucurbit growers need to scout on a regular basis.
- Pepper anthracnose is being reported in southern New Jersey.
- Cucurbit powdery mildew is active on all cucurbit crops.
- There have been no new reports of Late blight this this past week.
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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Vegetable Disease Briefs – 9/13/16
Veg IPM Update: Week Ending 9/07/16
Sweet Corn
Low numbers of European corn borer (ECB) adults continue to be captured this past week. At the present time, highest activity remains in the Cape May-Cumberland County border area (see ECB map). Earlier ECB catches were extremely low, and these moths, likely representing a partial third flight, will not present much of a threat to host crops. This is particularly true in light of the dominance this year of fall armyworm (FAW). FAW will probably remain the larger threat, and treatments for this pest will eliminate ECB in the process. As always, consider treating when the number of infested plants in a 50 plant sample exceeds 12%. Any planting remaining at or above threshold as it proceeds to full tassel should be treated, as this is the last stage at which ECB larvae will be exposed and vulnerable to insecticidal sprays. See the 2016 Commercial Vegetable Recommendations Guide for insecticide choices.
The highest nightly ECB catches for the previous week are as follows:
Green Creek 2 | Hillsborough 1 |
Allentown 1 | Lawrenceville 1 |
Crosswicks 1 | New Egypt 1 |
Downer 1 | Pedricktown 1 |
There has been no change in the fall armyworm (FAW) situation. Infestations continue throughout NJ, with high infestation rates in all parts of the state. This pest is devastating to small corn plants, and in fact the worst infestations are currently in shorter whorl stage plantings. Fields down to seedling stage should be scouted weekly for signs of infestation. We should expect this pest to be with us for the remainder of the sweet corn growing season. Treat when FAW alone or in combination with ECB damage exceeds 12% plants infested. FAW do not respond well to pyrethroid insecticides. The most useful products are those in the IRAC group 28 class (Coragen, Exirel) or the IRAC group 5 class (Radiant, Entrust), or combination products including these classes. See the 2016 Commercial Vegetable Recommendations Guide for insecticides effective against FAW.
Vegetable Disease Briefs – 9/6/16
- Cucurbit downy mildew has been confirmed on cucumber in New Jersey. To date, cucurbit downy mildew has been reported on cucumber and melon in the mid-Atlantic region. All cucumber growers need to add a downy mildew-specific fungicide to their weekly fungicide programs. All cucurbit growers need to scout on a regular basis.
- Dickeya dianthicola was confirmed in New Jersey on ‘Dark Red Chieftain’ originating from New Brunswick, Canada this past week. This is the third report of Dickeya on seed originating from Canada this summer. ‘Yukon Gold’ and ‘Reba’ from New Brunswick, Canada have also tested positive. In total, Dickeya dianthicola has been confirmed in 16 states to date. All potato growers are encouraged to scout fields and report any suspect plants/tubers. The best method for keeping your potato operation Dickeya-free is to adopt your own 0% Dickeya-tolerance policy.
- Pepper anthracnose is being reported in southern New Jersey.
- Cucurbit powdery mildew is active on all cucurbit crops.
- There have been no new reports of Late blight this this past week.
Veg IPM Update: Week Ending 8/31/16
Sweet Corn
A few European corn borer (ECB) adults have been captured this past week. At the present time, highest activity is in the Cape May-Cumberland County border area (see ECB map). Earlier ECB catches were extremely low, and these moths, likely representing a partial third flight, will not present much of a threat to host crops. This is particularly true in light of the dominance this year of fall armyworm (FAW). FAW will probably remain the larger threat, and treatments for this pest will eliminate ECB in the process. As always, consider treating when the number of infested plants in a 50 plant sample exceeds 12%. Any planting remaining at or above threshold as it proceeds to full tassel should be treated, as this is the last stage at which ECB larvae will be exposed and vulnerable to insecticidal sprays. See the 2016 Commercial Vegetable Recommendations Guide for insecticide choices.
The highest nightly ECB catches for the previous week are as follows:
Eldora 2 | Georgetown 1 |
Allentown 1 | Lawrenceville 1 |
Crosswicks 1 | Little York 1 |
Folsom 1 | Pennington 1 |
There has been no change in the fall armyworm (FAW) situation. Infestations continue throughout NJ, with high infestation rates in all parts of the state. This pest is devastating to small corn plants, and in fact the worst infestations are currently in shorter whorl stage plantings. Fields down to seedling stage should be scouted weekly for signs of infestation. We should expect this pest to be with us for the remainder of the sweet corn growing season. Treat when FAW alone or in combination with ECB damage exceeds 12% plants infested. FAW do not respond well to pyrethroid insecticides. The most useful products are those in the IRAC group 28 class (Coragen, Exirel) or the IRAC group 5 class (Radiant, Entrust), or combination products including these classes. See the 2016 Commercial Vegetable Recommendations Guide for insecticides effective against FAW.
Vegetable Disease Briefs – 8/25/16
- Cucurbit downy mildew has been confirmed on cucumber in New Jersey. To date, cucurbit downy mildew has been reported on cucumber and melon in the mid-Atlantic region. All cucumber growers need to add a downy mildew-specific fungicide to their weekly fungicide programs. All cucurbit growers need to scout on a regular basis.
- Dickeya dianthicola has been confirmed in 16 states to date. All potato growers are encouraged to scout fields and report any suspect plants/tubers. The best method for keeping your potato operation Dickeya-free is to adopt your own 0% Dickeya-tolerance policy.
- Pepper anthracnose is being reported in southern New Jersey.
- Cucurbit powdery mildew is active on all cucurbit crops.
- Late blight was reported on tomato near Blacksburg, Virginia this past week.
Veg IPM Update: Week Ending 8/24/16
Sweet Corn
European corn borer (ECB) adult activity has declined to nearly nothing at this time, and no map image is in this edition. The second flight was extremely low, with fall armyworm injury much more dominant this year. It is possible that we will have a partial third flight, but as the second was so low, it is not likely that it would be of much consequence. As always, consider treating when the number of infested plants in a 50 plant sample exceeds 12%. Any planting remaining at or above threshold as it proceeds to full tassel should be treated, as this is the last stage at which ECB larvae will be exposed and vulnerable to insecticidal sprays.
See the 2016 Commercial Vegetable Recommendations Guide for insecticide choices.
The highest nightly ECB catches for the previous week are as follows:
Beckett 1 | Lawrencevile 1 |
Chester 1 | Little York 1 |
Crosswicks 1 | Matawan 1 |
Georgetown 1 |
Fall armyworm (FAW) infestations continue throughout NJ, with high infestation rates now appearing in all parts of the state. This pest can be devastating to small corn plants, and in fact the worst infestations are currently in shorter whorl stage plantings. Fields down to seedling stage should be scouted weekly for signs of infestation. Treat when FAW alone or in combination with ECB damage exceeds 12% plants infested. FAW do not respond well to pyrethroid insecticides. The most useful products are those in the IRAC group 28 class (Coragen, Exirel) or the IRAC group 5 class (Radiant, Entrust), or combination products including these classes. See the 2016 Commercial Vegetable Recommendations Guide for insecticides effective against FAW.