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• Downy mildew remains active on all cucurbit crops. All cucurbit growers should include downy as well as powdery mildew specific fungicides in their weekly maintenance sprays. Please remember different modes-of-Action (i.e., FRAC groups) to help manage fungicide resistance develop in both pathogens. To track the progress of CDM in the US please visit http://cdm.ipmpipe.org/
• There have been no new reports of late blight in New Jersey since 8/14. Remember as fall approaches and night temperatures become cooler and light fogs begin to develop conditions for late blight development improve. All abandoned tomato blocks/fields need to be disked under as soon as harvesting is done or sprayed with gramoxone to kill all living foliage. To track late blight in the US please visit http://usablight.org/
• Bacterial leaf spot remains active on pepper and tomato crops. Bacterial canker on tomato has also been reported.
• Pepper anthracnose has been reported. All pepper blocks/fields where anthracnose is present and harvesting is completed need to disked under and/or sprayed with gramoxone as soon as possible. Infected plant material left in the field will only serve as a source of inoculum for further spread of the disease.

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Sweet Corn

European corn borer (ECB) adult catches have become somewhat more consistent in southern NJ over the past week, but with very few individuals captured north of Burlington County (see ECB map). This late summer flight appears to be a fairly week one. 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 2015 Commercial Vegetable Recommendations Guide for insecticide choices.

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• Bacterial leaf spot race 6 has been confirmed on bell pepper in the Vineland area. This has major implications since all widely-grown peppers (bell and non-bell) in New Jersey do not have resistance to this race. All bell peppers growers need to scout on a regular basis and know what BLS resistance packages are present in the varieties they are growing.
• There have been no new reports of late blight in New Jersey since 7/8 although it has been reported in other States in the region. To track late blight in the US please visit http://usablight.org/
• Cucurbit downy mildew has been reported on cucumber in New Jersey and on cucumber and butternut squash. All cucurbit growers should include downy as well as powdery mildew specific fungicides in their weekly maintenance sprays. To track the progress of CDM in the US please visit http://cdm.ipmpipe.org/.
• Basil downy mildew remains active across the region.
• Pepper anthracnose has been reported.

• There have been no new reports of late blight in New Jersey since 7/8. To track late blight in the US please visit http://usablight.org/
• Cucurbit downy mildew has been reported on cucumber in New Jersey and on cucumber and butternut squash in PA this past week. To track the progress of CDM in the US please visit http://cdm.ipmpipe.org/.
• Bacterial leaf spot is being reported on pepper and tomato.
• Basil downy mildew remains active across the region.
• Phytophthora blight has been reported on multiple crops.
• Pepper anthracnose has been reported in southern New Jersey.

• Cucurbit downy mildew has been reported as far north as Eastern Maryland and southern Delaware on watermelon. It was also reported on cucumber in Ohio this past week. All cucurbit growers should scout on a regular basis and consider including downy mildew specific fungicide(s) to their weekly maintenance programs. Wet weather is predicted every day this upcoming week making conditions ideal for downy mildew development around the state and region. For more information on the control of downy mildew on specific cucurbit crops please see the 2015 Commercial Fungicides Recommendations Guide. To track the progress of CDM in the US please visit http://cdm.ipmpipe.org/
• Bacterial brown spot has been reported on lima bean in southern New Jersey.
• Anthracnose has been reported on snap bean in southern New Jersey.
• Phytophthora blight on pepper and cucurbit crops have been reported. The heavy rains that have been around lately have been ideal for P. capsici development. All growers need to scout on a regular basis and applied preventative fungicides on a regular basis as well as remain proactive by removing infected plants from field, making sure water is able to drain away from beds/fields, and cutting plastic to help dry out beds.
• A new, more aggressive form of Black leg has been reported in potato in southern New Jersey.
• Bacterial leaf spot is being reported on pepper and tomato.
• Basil downy mildew remains active. All basil growers should continue to scout and be proactive.
• Late blight has been reported on potato as far north as North Carolina near the Virginia border. There have been no reports of late blight in the region to date. To track late blight in the US please visit http://usablight.org/

The weather has been a double-edged sword of late throughout most of the mid-Atlantic region. The extremely hot weather with temperatures at or above 90 these past few days have been good for slowing disease development down. At those temperatures, its even too hot for pathogens to develop!

Unfortunately, the weather has also brought with it a lot of wind and rain these past few days and weeks. We all know what this leads to. Remember that bacteria need a wound or natural opening to enter a plant and cause an infection. The heavy winds and driving rains that beat up plants also help create the wounds that allow this to occur so its not unlikely to see an uptick in bacterial problems across a number of crops, such as in the case of bacterial leaf spot in tomato and pepper, after the weather we’ve had this past week.

Growers need to be proactive with copper applications and/or disinfestant applications prior to and/or after such events. Growers should also avoid working in fields when foliage is wet, if possible. This is extremely important if a bacterial problem is already present in the field!

The wet weather, along with the high humidity and prolonged leaf wetness also makes nice for many fungal pathogens, both leaf and soil-borne. Phytophthora blight in cucurbits, pepper, eggplant and tomato;  Early blight in tomato;  Alternaria and Anthracnose in cucurbits; and downy mildews just to name a few are favored by our current weather conditions, especially after temperatures cool down after todays weather front passes through the region.

During these conditions, all growers need to remain diligent and keep up with their protectant fungicide programs as long as field conditions allow and be proactive instead of reactive. After today, we get a few hours of dry weather before potential rains return on Thursday night into Friday.