Tuber bulking for Manitoba potato crops is progressing well with some fields already being harvested for direct from field processing, the Aug. 10 provincial potato report from Manitoba Agriculture’s Vikram Bisht said.
There was scant rainfall over the past week, with crop demand exceeding the amount of moisture received. Bisht noted supplemental irrigation was ongoing with fertigation having stopped in many fields. Temperatures have been warm with highs ranging from 30C to 35.9C, while overnight 8.5C to 11.2C.
Trap counts of European corn borer delta have been reduced dramatically with crop damage of low concern, the report said. There have been no late blight spores found in Spornado traps, while verticillium early dying is showing up as the potato fields near maturity.
“In seed fields, aphid numbers were significantly high, and very high numbers of green peach aphids were trapped in southern Manitoba. Potato aphids trapped in all seven sites across Manitoba,” Bisht said in the report. “Use of aphid oil with insecticide is recommended if near a commercial potato field or has some levels of PVY in-field itself.”