Insecta, Homoptera, Psyllidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host-plants: peach, more rarely apple and exceptionally quince.
- Adult: overwinters in orchards, on trees or any other support. Activity resumes in January and feeding and mating take place. Although capable of jumping, adults usually fly. Females lay clusters of 6-10 eggs, usually at the base of buds or along crevices. Females of the next generations lay their eggs on green organs, and later on flower peduncles, petioles and the surface of leaves. Number of eggs produced: 400-600.
- Egg: embryonic development lasts 6-25 days depending on temperature.
- Nymph: development occurs in 5 stages. The young nymph of the first generation penetrate inside the buds to feed. The last 2 stages occur on the calyx. The young nymphs of later generations live on the underside on leaves each within a droplet of honeydew (*) . After the 3rd moult, they spread to the petiole, young twigs or fruit peduncles and are still covered with considerable quantities of honeydew (*) ; nymphs settle on the foliage after the last moult.
- There are 4-6 generations per year depending on the region and crop conditions, individuals of the last generations emerging in September-October. Members of the 1st and 2nd generations are usually few; those of the 3rd generation occur in large numbers and may cause severe damage; populations spread to the foliage in autumn.
- Nymphs and adults inbibe in vast quantities of sap, which causes an exhaustion of trees and crop losses.
- Honeydew provokes a scorching of the foliage, sooty moulds developing on it (*) . Severe attacks result in partial leaf fall during August.
- Aphid populations are sometimes naturally checked by predatory bugs which are very active when no treatment is undertaken.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.