In this section:
Green Peach Aphid
Myzus persicae
Affected
Peaches and nectarines
Description
Eggs are green when layed but turn shiny black in colour. Feeding aphids are 2-3 mm in length and translucent pale green in colour. When newly hatched the aphids are smaller and amber brown in colour.
Where and when to look
Buds, particularly on the ends of shoots should be inspected during winter for the presence of shiny black eggs. Young aphids will emerge around the time of budswell and cluster on the opening buds.
Damage
The first generation of aphids feed on the developing buds weakening the flowering and subsequent fruit set. Foliage damage commences as soon as the leaves emerge from the buds. The leaves turn yellow, shrivel and fall. In severe infestations the shoots are killed. Aphids will continue to feed on peach and nectarine leaves until the foliage hardens off in early summer.
Failure to control an infestation can severely reduce cropping in the subsequent year as well as the current years crop. If infestation of young non bearing trees is not controlled it can distort the framework of the tree.
Control
Where eggs are detected, a single spray should be applied at pink bud. This should provide complete control, but if infestation continues repeat application as necessary. Green peach aphid has developed resistance to several insecticides in some districts.
