SE Michigan: Monroe, Washtenaw, Wayne, and Lenawee counties regional report for August 19, 2009

Weather

The pattern of warm, humid weather continues in the southeastern region of Michigan, which is certainly more typical for this time of year. Daytime high temperatures have ranged from the mid-80s to low 90s, and the nights have been warm and humid. Rainfall amounts varied from 0.2 inches to 0.75 inches across southeast Michigan over the last seven days. Because of the dry conditions, growers that have irrigation systems are using them extensively.

Crop reports

Sweet corn harvest is continuing in southeast Michigan, and all indications suggest that the crop is very good this year. Zucchini, peppers and eggplant continue to be picked, and watermelons are also being harvested in a number of locations. Tomato fruits are developing well, and some field-grown tomatoes are being picked. The warmer, more humid weather has accelerated tomato and vine crop development dramatically. Pumpkin and cantaloupe development is progressing at a good rate.

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. If cucurbit downy mildew has been confirmed in your county, you should be applying protectant fungicides at the recommended intervals to cucumber, pickle, and melon plantings. See Mary Hausbeck’s article for recommendations. I have observed powdery mildew on pumpkins and squash in some fields. Growers that have powdery mildew on pumpkins and squash should use a systemic fungicide plus a protectant fungicide on pumpkins and squash. Septoria leaf spot of tomatoes is being noted at this time in some plantings, and other leaf blight diseases, such as early blight and late blight, are appearing in Ohio and in some places in Michigan. Verticillium wilt in eggplant has been documented in some locations.

Trap captures of western bean cutworm have declined in the last week, as have numbers of adult variegated cutworm. European corn borer adult numbers have increased in my traps during the past week. I am continuing to capture small numbers of corn earworm, squash vine borer, and fall armyworm adults in traps located in southeast Michigan.

Corn earworm
Corn earworm.

mildew
Powdery mildew on pumpkin leaf.

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