My squash plants are blooming heavily, but aren’t producing many fruit. Why?

Squash and other vine crops are monoecious.  Monoecious plants have separate male and female flowers on the same plant.  Male and female flowers are similar in appearance.  However, female flowers have small, immature fruits at their base.  Pollen is transferred from the male to the female flowers by bees and other pollinators.  When properly pollinated and fertilized, the female flowers develop into fruit.  The first flowers to appear on squash and other vine crops are predominately male.  As a result, fruit production is poor when the plants begin to flower.  The squash plants should begin producing a good crop within a few weeks as the number of female flowers increases.  

Unfavorable weather and the use of insecticides can also affect fruit set on vine crops.  Cool, rainy weather during bloom reduces bee activity.  Fewer bees visiting the garden results in poor pollination and poor fruit set.  Apply insecticides in the garden only when necessary to avoid harming bees and other pollinators.