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Updated Pest Scouting Advisories for Field Crops in Ontario

Corn that was seeded around mid-May in southwestern Ontario are at grain filling periods (R2 to R3) and soybean plants are also at pod-filling stages (R5 to R6). During the grain filling periods, several pests infest the crop and cause significant yield losses. In this report, we provide overview on the model based predicted risk of four economically important pests of corn and other field crops. We also encourage corn growers to access site-specific advisories for all 6 pests by registering corn fields on www.weathercentral.ca.


(i) Western bean cutworms: The predicted emergence and peak flight of Western bean cutworms were around the last week of July to the first week of August in the southwest region. It is reported that the damage and trap report count is significant in the southwest region. The predicted risk of the pest emergences are around the second and third weeks of August in the central and eastern regions. Growers are suggested to scout fields and apply appropriate control measures to prevent damage from the pest.

Corn Disease
(ii) Japanese beetles: Japanese beetles cause significant foliage damage in soybean and also damage ear and foliage of corn. The predicted dates of the pest emergence were around the first week of July in southwest region and the second to third weeks of July in the central and eastern regions. The model predicts that pest activities will continue until the mid to third weeks of September. In recent weeks, higher foliage damages were observed in the soybean fields in Chatham-Kent. Growers are suggested to scout their fields to monitor crop damage and the pest populations.

(iii) Corn ear worms: Ear worms cause significant damage inside corn ears. In soybean, the pest defoliate soybean and affect seed filling pod. The model predicts the risk of the pest emergence during the second week to Mid-August in southwestern region and during the third to last weeks of August in the central and eastern regions.

(iv) Corn root worms: Corn root worms also cause silk clipping in corn. The beetle population can be monitored in the fields. The pest migrates to Ontario from the southern USA. The model predicted the larvae emergence around the third to last weeks of July in southwest region and around the first to second week of August in central and eastern regions. Growers can monitor the beetle populations and silk clipping in their corn fields.

Source: Weathercentral


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