Fungicides

Asked March 18, 2020, 2:10 PM EDT

Need help with stuff to treat fungus & bacteria for tomato, pepper, cucumber plants. I already use copper and need other alternatives cause it doesn't work well all the time. Can you tell me which active ingredients would be best to use or look for? typically problems in this area for tomatoes/peppers: Early blight -Alternaria linariae (=A. tomatophila; formerly known as A. solani), Late blight (Phytophthora infestans), both bacterial spot (four species of Xanthomonas) and speck (Psuedomonas syringae pv tomato), Septoria leaf spot (Septoria lycopersici) , anthracnose, Fusarium wilt (mainly Races 1, 2, and 3) , powdery mildew, verticillium wilt, Alternaria stem canker, Any help would be appreciated!

Harford County Maryland

1 Response

Hi,
Please see the information in the VA Tech pest management guide for preventing and managing disease problems in home vegetable crops. It covers techniques for preventing disease issues and gives recommendations for using organic and synthetic fungicides:
https://www.pubs.ext.vt.edu/content/dam/pubs_ext_vt_edu/456/456-018/ENTO-336B.pdf (especially Table 2.4, page 29)

Early blight and septoria leaf spot are the two most common foliar diseases in Md and they can be found, to some degree, in just about every backyard and commercial crop (even with a spray program in place). The fungicides available to home gardeners will not cure an infection. They must be applied prior to visible symptoms to reduce infection.

Late blight is fairly uncommon throughout most of MD. The pathogen is favored by cool, wet conditions. Please contact us with photos if you think you are seeing late blight symptoms during the growing season:
https://extension.umd.edu/hgic/topics/late-blight-tomato-potato

There are no fungicide treatments for fusarium wilt and verticillium wilt. HGIC's vegetable problems web pages:
https://extension.umd.edu/hgic/topics/vegetable-problems

If you are a commercial producer you should contact your county ag agent and refer to EB-236, the Mid-Atlantic Commercial Vegetable Production Recommendations:
https://extension.umd.edu/mdvegetables/mid-atlantic-commercial-vegetable-production-recommendations
Jon