Description, Biology, Life Cycle, Damage, Common Names, Images
- The symphylid can be found in relatively stable foci in cultivated soil, the texture of which permits the appearance of fissures, microcavities and earthworm galleries favourable to its movement. Well adapted to life in the soil, the symphylid undertakes seasonal or daily vertical migrations between the surface and a depth in the soil which may be greater than 50 cm. Population levels in cultivated soil may reach about 100 to 600 individuals per square metre.
- Adults: live for a long time, probably several years, moulting at more or less regular intervals. Between each moult, it may or may not feed. Spring populations are made up of adults only. Symphylids feed on algae, fungi and mosses; however, at certain periods, they are attracted by seeds and very young roots, where they eat the extremities, and by older roots which they chew, eating the absorbant hairs (*) .
- The duration of development from an egg to an adult is relatively rapid for a myriapod: 2 months at 27_C, 6 months at 5°C. Egg laying appears possible only at a temperature above 10°C.
- Most egg laying occurs in spring, but some continues until autumn. Under favourable conditions, individuals arising out of spring eggs may mature and lay eggs at the beginning of the autumn.
- Attacks on seeds and roots cause a reduction in density, slowing in growth and decreased yield. Damage is frequent in glasshouses and cultivated fields. In the open, damage is particularly marked in young, widely separated plants such as beet, maize and potato.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.