The figure compares emergence in untreated plots and plots treated with Steinernema riobravis. Yellow mulch, however, attracts the adults. Aphids Aphids are often controlled adequately by natural enemies until late in the season, unless you are in an area that has had problem with virus. If virus has not been a concern in your area, then it helps to limit insecticides to encourage natural enemies. However, if virus has been a problem, deterring aphids from moving into fields with reflective mulches, using resistant varieties when available and preventing movement of aphids from weeds or among different plantings becomes very important.
Resistant varieties using both conventional and transgenic methods are available for squash.
Successive plantings make it harder to control virus transmission, as the vectors that build in one crop move onto the next. Also, both the green peach and the melon aphid have shown problems with insecticide resistance. Careful follow-up scouting after a spray is important, and be prepared to try other classes of insecticides. There are new materials that are selective against aphids. Squash Vine Borer Squash vine borer has one generation a year.