Description, Biology, Life Cycle, Damage, Common Names, Images
This bug lives mainly on apple and pear, but may also attack other plants such as hawthorn(Crataegus), and sweet chestnut.
- Adults: overwinter in various shelters, under heaps of dried leaves, in crevices of tree trunks, etc.
Following bud burst, adults emerge from their shelters and move to the underside of foliage where they feed on intracellular fluids.
Each female lays about one hundred eggs.
- Eggs: laying starts in early May, and continues for about a month. Using her oviscapt, the female inserts her eggs in the leaf tissue along the main vein, covering the part protruding with a drop of frassal liquid.
- Nymph: this remains on the underside of leaves and reaches maturity in about twenty days. It feeds exactly like the adult.
New adults appear in June; the second generation develops in June-July and the third in August-September.
- 3 generations per year, from May to September.
This insect prefers pomaceous plants, especially pear (*) .
It is harmful not only because of direct damage (sucking of sap) but also through the consequences of the many wounds it inflicts on its host: necrosis and drying of foliage, and the deposit of liquid excrement which obstructs the stomata of leaves and on which sooty moulds (*) develop.
Heavy infestations may cause complete defoliation of trees.
This species is preyed upon by other Heteroptera, particularly the mirid bug Stethoconus cyrtopeltis which, however, cannot succeed in preventing an infestation.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.