Manitoba Insect & Disease Update – Issue 5: June 15, 2016

The Manitoba Insect and Disease Update is now posted at:

Insects: Cutworms continue to be an issue in some areas. Flea beetle feeding continues, although foliar use of insecticides for flea beetle management has not been widespread. In many fields plants are now getting to stages more tolerant to feeding by flea beetles. Alfalfa weevil is being noted at high levels in some alfalfa fields.

Plant Pathogens: Rust diseases in cereal crops and sunflower have been observed in Manitoba. Root rots in soybeans have also been reported from various locations in Manitoba. Scouting and monitoring progression of disease symptoms in the field will help in making fungicide application decisions.

Several samples of soybeans showing root rot symptoms have been submitted to Manitoba Agriculture’s Crop Diagnostic lab. Root rot is soybeans are caused by pathogens like Fusarium spp, Phytophthora sojae, Rhizoctonia spp and Pythium spp

Submitted by: John Gavloski, Entomologist & Pratisara Bajracharya, Field Crop Pathologist, Manitoba Agriculture

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