Nematoda, Tylenchida, Tylenchidae .
Description, Biology, Life Cycle, Damage, Common Names, Images
- Host plants include mainly Citrus, vine and olive.
- Eggs hatch a few days after egg-laying and it is possible to distinguish between male and female juveniles from the 2nd stage.
- Male juveniles become sexually mature in 1 week and live as ectophytes. Without growing, they emerge as males devoid of stylet and do not feed but can survive in the soil for several months.
- Female juveniles live as ectophytes and then half-penetrate the root (*) . The cells surrounding the head of the nematode change into a nutritious area. The posterior part of the female remains outside the root, enlarges and blisters.
Egg-laying (about 100 eggs are laid) takes place in a jelly-like covering which makes soil particles stick together.
- The length of the life-cycle reaches 6-8 weeks and fertilization does not seem to be obligatory. This nematode species occurs in very large numbers and can survive up to 30 months without a host.
- Affected trees firstly exhibit a lack of vigour which is followed by chlorosis. Leaves fall, which may result in the drying out of the tips of twigs (*) .
This affliction has been given the name of 'slow decline' owing to the slow development of the symptoms. The most seriously affected trees no longer yield.
HYPPZ on line : Species (scientific name), Pests (common names), Glossary, Crops.