Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants: Gramineae, especially wheat, oats, barley and maize.
- Adult: the fertilized female resumes activity in April and flies in search of a gramineous host. It feeds on the tenderest leaves, rasping them and sucking up cell contents. It deposits eggs at the base of leaves or inside the newest sheath. It then moves on to the ear when it is visible and lays eggs inside the glumes and in young ovaries. The female places its eggs under the plant's epidermis with its oviscapt (*) .
- Nymph: feeds in the sheaths or on the ears by biting the floral parts and developed seeds (*) ; once it has completed its development, the nymph "pupates" in the sheath or in the ear.
- There is 1 generation per year in France, 2 in certain countries like Scotland, Germany, the Netherlands, and even sometimes a 3rd partial generation (Sweden).
- Males emerge in early June, fertilizing the females and dying soon afterwards. After feeding for a while, females leave the host plant in late July (when the water content of ears drops below 45%) and fly to overwintering sites, forming exceptionally vast clouds.
- By damaging the ovaries, nymphs can cause the plant to become sterile, which results in a severe reduction in grain yield (*) .
- Feeding punctures of nymphs lead to the formation of flecks on the grain, pasta manufacturers then refusing the semolina.
- Adults 'bite' people and may enter houses in large numbers.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.