When we returned recently from holiday we found, as is to be expected at this time of year, a growth explosion in the glasshouses and polytunnel, and a most unwelcome population explosion of aphids. There are often one or two times in the year when aphids can become problematic. The first attack of the year typically occurs on the broad beans. At that early time of the year there can be insufficient numbers of predators to keep them under control, and the gardener may need to intervene to prevent significant loss of crop. Generally a little later in the year, fruit trees and bushes are another popular target for aphids, where they can cause a fair bit of damage to the young leaves and shoots. It was on our fruit trees that we noticed a substantial infestation that was not present when we left. Continue reading →