Monday, August 31, 2015
Late season aphids
Also in the photo you can see various sizes of wingless aphids nymphs. If the nymphs can avoid being eaten by lady beetle or lacewing larvae, they will all grow into winged adults. As a nymph grows in size it must shed its old, smaller exoskeleton before growing into a new larger exoskeleton. Cast-off exoskeletons appear in the photo as white to grey bits of fluff.
Aphid populations can grow rapidly but eventually crash as pecan leaves become less suitable for aphid feeding. Spraying pecan trees for aphid control seems only to create insecticide resistant strains of the aphid. In our orchard, we have chosen to let the aphids run their course and not spray to control the population.