Description, Biology, Life Cycle, Damage, Common Names, Images
- almond is the preferred host plant of this bug (*) , which may also attack the pear, poplar and aspen (Populus spp.).
- Fecundity of the female: 70 eggs laid singly or in groups; the female inserts its oviscapt into the leaf, close to the main vein.
- Embryonic development lasts 15 to 18 days (1st generation) or 10 to 12 days (following generations).
- The 5 nymphal instars last respectively: 10 to 12 hours, 36 hours, 48 hours, 48 and 72 hours.
In general, 4 following generations occur in southern Portugal: the 1st in June, the 2nd in July-August, the 3rd in August and the last (hibernationg generation) in August-September.
- The tree suffers from feeding punctures which give the leaf a yellow flecked aspect, egg-laying scars and abundant excrement, visible in the shape of black spots strewn across the leaf lamina and reduced photosynthetic activity. Often, the attacked leaves drop, especially during dry and hot weather. This drop disturbs the normal development and ripening of the fruit.
- On hatching from the egg, the newly emerged bugs widen the egg-laying incision which becomes an easy entry point for pathogenic fungi.
- Most damage occurs during high-summer and is caused by the 3rd and 4th generation bugs.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.