Summer squash leaves

Asked July 3, 2019, 9:34 AM EDT

Summer squash has declined in the last 2-3 days with the heat and humidity. Squash is grown on raised plastic with drip irrigation. No irrigation has been needed this year. Quality seed was purchased from RUPP. No insects evident. What is this?

Isabella County Michigan fruits and vegetables

3 Responses

Hello. Did you notice anything on the leaves before they turned brown? If so, can you send a photo of a leaf before it turns brown? Thank you.

No, they went right from yellow to brown.

Without anything else to go on this looks like this may be bacterial wilt suggested by the interveinal chlorosis /necrosis and sudden onset. Check out the following links:

http://vegetablemdonline.ppath.cornell.edu/factsheets/BWSigPoster.htm

https://extension.umn.edu/diseases/bacterial-wilt
Nutrient imbalances can also show similar symptoms:
http://nwdistrict.ifas.ufl.edu/phag/2015/07/10/are-you-sure-you-need-that-gypsum-calcium-induced-deficiencies-in-vegetables/