Nepaljam x Oaxaca
Active Member
Nematodes are tiny roundworms, also called eelworms. They have no respiratory or circulatory systems. Their nervous system is so simple it can be described at the level of individual cells.
Crop damage by nematodes is underrated due to their small size and the unseen (mostly underground) nature of their pathology. Above-ground symptoms consist of stunting, reduced yield and insipient wilting (drooping of leaves during midday withrecovery at night). Farmers may misinterpret symptoms as mineral deficiencies or drought, mysteriously arising despite adequate nutrients and moisture. These symptoms do not occur uniformly across a field, but in pockets of scattered infestation. Below-ground symptoms are more distinctive, including root knots or galls. Six nematodes are known to infest Cannabis. All species attack roots except one.
Root knot nematodes embed themselves in roots and induce plants to form giant cells or syncytia. Syncytia swell into root galls and stimulate formation of adventitious rootlets, creating a bushy root. Compound galls arise on larger roots forming "root knots": hypertrophied roots with a rough surface.
The stem nematode, Ditylenchus dipsaci, uniquely lives above the ground and does not infest roots. Initial symptoms arise in stems, branches and leaf petioles, which swelland become chlorotic. Stems subsequently become twisted and distorted with shortened internodes. D. dipsaci is found inNorth America, southern Africa, Australia, and temperate areas of Asia
Crop damage by nematodes is underrated due to their small size and the unseen (mostly underground) nature of their pathology. Above-ground symptoms consist of stunting, reduced yield and insipient wilting (drooping of leaves during midday withrecovery at night). Farmers may misinterpret symptoms as mineral deficiencies or drought, mysteriously arising despite adequate nutrients and moisture. These symptoms do not occur uniformly across a field, but in pockets of scattered infestation. Below-ground symptoms are more distinctive, including root knots or galls. Six nematodes are known to infest Cannabis. All species attack roots except one.
Root knot nematodes embed themselves in roots and induce plants to form giant cells or syncytia. Syncytia swell into root galls and stimulate formation of adventitious rootlets, creating a bushy root. Compound galls arise on larger roots forming "root knots": hypertrophied roots with a rough surface.
The stem nematode, Ditylenchus dipsaci, uniquely lives above the ground and does not infest roots. Initial symptoms arise in stems, branches and leaf petioles, which swelland become chlorotic. Stems subsequently become twisted and distorted with shortened internodes. D. dipsaci is found inNorth America, southern Africa, Australia, and temperate areas of Asia