What is the best way to control caterpillars on grape vines
The caterpillars were large and black and all over the vines.
These caterpillars are called the grapevine moth and can devastate the vine very quickly. Yates Success Ultra which contains Spinosad, an insecticide derived from a naturally occuring soil bacteria, will control these insects. Apply it when they are first seen and repeat 7-14 days later. The caterpillars stop feeding immediately but may take up to 3 days to die.
Answered: 5 Sep, 2011