SE Michigan: Monroe, Washtenaw, Wayne and Lenawee counties regional report for July 28

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, insects, and diseases

The heat and humidity continued to be in place over southeast Michigan for the last seven days. Highs reached into the mid-90s during the day, and stayed in the upper 60s to low 70s at night. Dewpoints were consistently in the upper 60s and low 70s. Rainfall was scattered, but heavy in some locations. The Petersburg weather station recorded 1.66 inches of rainfall from July 21 to July 27.

I have seen instances of anthracnose on pepper, Septoria leaf spot and early blight on tomatoes, and Phytophthora capsici on summer squash and pumpkin. Downy mildew has started showing up on cucumbers, and powdery mildew has begun to occur on squash in some areas.

Corn earworm moth trap catches have declined over the past week. Western bean cutworm moths are being caught, as are European corn borer moths. Diamondback moth captures continue to be high. Black cutworm moths have been quite active and numerous on some farms. Squash bug numbers are building to large numbers in some pumpkin and squash plantings.

Crop report

Sweet corn harvest is in full swing now in southeast Michigan and northern Ohio. Summer squash crops are very good, as are zucchini and cabbage. Tomatoes are developing rapidly now. Watermelons are also growing very well, and are being harvested now in some places. Peppers are being harvested.

Squash bug adult
Photo 1. Squash bug adult.

Photo 2. Squash bug eggs.

Photo 3. Squash bug nymphs.

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