Nematodes
Nematodes are tiny roundworms, also called eelworms. Nematodes are not closely related to earthworms. Built on a much smaller and simpler scale, they have no respiratory nor circulatory systems. Their nervous system is so simple it can be described at the level of individual cells. Caenorhabditis elegans, for instance, has exactly three hundred and two neurons.
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 with recovery 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 southern root knot nematode, Meloidogyne incognita, has been reported on fiber cultivars in Europe, the former USSR, Brazil, and the southern United States. M. incognita is the most widely distributed worldwide, and attacks hundreds of hosts. Two other species are rarely reported: the northern root knot nematode Meliodogyne hapla and the Java root knot nematode Meloidogyne javanica.
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 swell and become chlorotic. Stems subsequently become twisted and distorted with shortened internodes. Plants are stunted. D. dipsaci is found in North America, southern Africa, Australia, and temperate areas of Asia. But Cannabis disease has only been described from fiber varieties in Europe. Other nematodes are rarely reported: cyst nematodes (Heterodera schachtii, H. humuli), needle nematodes (Paralongidorus maximus), and root lesion nematodes (Pratylenchus penetrans).
Thanks Hessam I tried to find them but without ever seeing them or knowing what they were was frustrating, Thanks I was able to pull this off a website and posted for anyone who may have a problem with those little buggers.