A pleasant late July rain is a good way to kick off soybean grain fill. It additionally helps management pests like spider mites earlier than they’ll arrange store within the maturing crop.
On this episode of the RealAgriculture Soybean Faculty, we go to with PRIDE Seeds market agronomist Matt Chapple on the firm’s training centre at Ache Court docket, Ont. It’s mid August and spider mites are nonetheless lively in soybean plots which have endured dry rising situations all through 2022.
Chapple notes that spider mites are sometimes seen on the sides of fields round winter wheat harvest, however after “a pleasant one or two inches of rain” the pest is sufficiently suppressed to forestall them from transferring into soybean fields. However for a lot of areas of Ontario, these rain occasions have been onerous to search out in 2022. The pests didn’t wash away — they continued to cycle and reproduce after which moved into soybean fields.
The microscopic bugs are concerning the measurement of a grain of sand. Once they do present up, Chapple says the crop tends to show a reddish or bronze color and die off. Sometimes, a hand lens is required to establish the tiny bugs, which congregate on the underside of the leaf. Scouting decrease within the cover is suggested to establish the pests as early as doable earlier than they’ll negatively impression the plant. In response to OMAFRA subject crop tips, management is required if growers discover 4 or extra mites per leaf or one severely broken leaf per plant previous to pod fill.
Chapple says spot spraying or spraying the perimeter of the sector may also assist management the pest. He additionally provides there are a number of methods that growers can pursue earlier within the season to maintain spider mites at bay. He recommends leaving grass or a foraging space for the mites alongside the sector edge. When subject edges are properly manicured and grass is mowed down, the pests typically get transferring and head for the close by soybean subject.
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