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Spider Mites in Corn

There is no specific spray threshold for spider mites in corn.  Avoid letting mite damage reach the ear leaves. 

Typically, spider mite infestations start at the field edge and work their way up the plant.  Mites favor hot, dry weather.  Mite populations can be naturally reduced via fungal infection after a rain event followed by high 95% humidity and temperatures below 85°F. Rain can also slow down spider mite population’s growth and relieve a corn plant’s moisture stress, but may not be enough to reduce populations below economic damage.  

Insecticides for corn often have short 7 day residuals, so fields should be re-scouted until corn reaches dent stage.  Insecticides labeled in North Dakota include bifenthrin and dimethoate. Registered miticides include etoxazole, propargite/Comite®, spiromesifen/Oberon®. 

Resources:

"Managing Two-Spotted Spider Mites on Soybeans and Corn in Minnesota" by K.Ostlie and B. Potter, University of MN.

"Spider Mites in Corn", North Dakota Field Crop Insect Management Guide (E-1143)

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