Home Crop Monitoring Pulse School: Assessing pea leaf weevil pressure

Pulse School: Assessing pea leaf weevil pressure

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Pea leaf weevils are out and lively and in the event that they’re current in your fields they’re doing foliar harm to pea and faba bean crops.

Meghan Vankosky, subject crop entomologist at Agriculture and Agri-Meals Canada, Saskatoon, Sask., joins Kara Oosterhuis for a dialogue about pea leaf weevil scouting and thresholds, on this Pulse Faculty episode.

“You want to get out when the plants are at the two to six node stage, really before root nodules are starting to form,” says Vankosky.

To find out the harm stage, Vankosky says {that a} nominal threshold is used for pea leaf weevil. If greater than 30 per cent of crops have harm on the terminal, or clam leaves, the brink for contemplating a foliar spray is met.

“The only issue, is that all of the research that we’ve done and not yet published, has shown that using foliar sprays really isn’t effective against pea leaf weevil,” says Vanksosky, including that the pest insect disperses over lengthy intervals of time, and the residual time of a foliar spray isn’t lengthy sufficient.

Grownup weevils are three to 4 millimetres lengthy, brownish gray in color, with stripes down their backs. Pea leaf weevil is completely different from different weevils, in that they’ve brief, broad noses as an alternative of lengthy noses. Harm to the plant could be very attribute U-shaped notches to peas or faba beans, however they will even assault alfalfa or candy clover.

Catch the complete dialog for extra on pea leaf weevil life cycle and this yr’s inhabitants distribution: 

Vankosky, and others, are at present researching whether or not or not carabid, or floor, beetles have any impact on pea leaf weevil populations, which might doubtlessly eat the larvae of pea leaf weevil that will usually emerge from root nodules.

Harm ranges to the crop are variable, in accordance with earlier analysis, and likewise in accordance with soil properties.

“If you’re planting your peas into pretty rich soil, with lots of nitrogen, then the impact of the larval feeding can be reduced, so there might not be a huge yield impact,” says Vankosky, “But, if you have a really weevil population at the right time of year, you can see seedlings dying because of the foliar damage, and then later on we’ll see that there’s so many weevils, in terms of adults and larvae, that it can be overwhelming for the plant.”

Vankosky means that if the populations are excessive sufficient, to make use of an insecticidal seed remedy at seeding to attempt to cut back threat because the season goes on. The Prairie Pest Monitoring threat maps from the earlier winter will point out if populations might be excessive.

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