Only use row covers if you had no evidence of squash borers the previous year, otherwise the overwintering pupae are in the soil just waiting to nibble on the plants. Wrap a collar of aluminum foil around the lower stems of the plant, dust or spray with spinosad or pyrethrum, or cover the plants with a floating row cover until they begin to flower. There are a few ways to prevent adults from laying eggs in May or June. How early or late can you plant squash? The adult moths are active in June, so plan on either transplanting in May or direct sow seeds in mid-June. The best squash vine borer prevention is to plant early. The cream colored larvae feed for 4 weeks or so and then dig into the soil to pupate over the winter. As they feed they leave behind a moist green/orange sawdust-like material called frass. Eggs hatch after a week to 15 days and immediately tunnel into the stem or base of the plant to feed. In mid-May to mid-June the larvae emerge as adult moths which are active for about a month of mating.įemales lay up to 250 flat, oval and dull red/brown eggs individually on all parts of the squash plant. This borer overwinters as either a pupa or larva under the soil. While they do most damage to squash and pumpkins, signs of infestation may occur in cucumbers and melons as well. Squash vine borers can be found throughout North America east of the Rockies, from Canada to South America. So how can you prevent squash vine borer larvae from killing your squash plants? Squash Vine Borer Life CycleĪs the saying goes “know your enemy,” so it is true when thinking about squash vine borer prevention. The insidious larvae of this clear-winged moth are responsible for the devastation. If you have ever had a squash plant look healthy one day and then suddenly wilt the next, you may be looking at the work of squash vine borers.
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