SE Michigan: Monroe, Washtenaw, Wayne, and Lenawee counties regional report for August 12, 2009

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

Weather, insect activity, and disease occurrence

Warm, humid weather continues in the southeastern region of Michigan. Rainfall has been scattered and is still needed in many areas. We experienced our first day in August over 90°F this past Sunday. Irrigation systems are still being utilized where they are available. Low numbers of western bean cutworm and squash vine borer continue to be trapped. Variegated cutworm trap numbers have fallen off dramatically. No European corn borer adults have been caught in my traps during the past week. Based on degree-day accumulations, the second flight of European corn borer is occurring, but it remains to be seen how large this flight will be. I am continuing to capture small numbers of corn earworm and fall armyworm in traps located in southeast Michigan.

Growers need to continue to be vigilant in terms of cucurbit downy mildew, especially on cucumbers and melons. Cucurbit downy mildew has continued to spread in cucumber and pickle fields in southeast Michigan, as well as in other regions of the state. I have observed powdery mildew on pumpkins and squash in some fields. Septoria leaf spot of tomatoes is being noted in some plantings. Verticillium wilt in eggplant has been documented in some locations.

Crop report

Sweet corn harvest is in full swing. I have noticed more roadside stands with sweet corn for sale recently. Peppers of all varieties are now being picked. Eggplant is also being harvested. Cabbage harvests continue. Tomato fields that I have observed have good fruit set, and the plants generally appear very healthy, but need more rain and warmer temperatures. Zucchini is being picked. Pumpkin, watermelon and cantaloupe development looks excellent in the fields I have observed. The potato crops look very good. Potatoes have been harvested in some locations and other plantings may soon be harvested.

European corn borer larva.

Downy mildew.

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