大蒜线虫有大蒜根腐线虫和马铃薯茎线虫两种，分布广泛，寄主达百余种植物。
(1) dangerous symptoms;
Garlic root rot nematode in roots and stems of adult and larvae damage the garlic plant, is the typical symptoms of plants without roots. The victim after the garlic dwarf yellow, can not carry out new leaves, garlic leaf curl, slender stems and false folding; garlic swelling thick and short, deformity, early root bending; dark brown spots, followed by stem disc decay, root loss, plant death, sprout deficiency.
Potato stem nematode, which is invaded by the adults and larvae from the stem of the garlic plant, is harmful to the propagation around the bulb. Typical symptoms are from the rhizosphere to the stem began to soften, metamorphism, decay, chlorosis, dying. The victim of garlic root tissues was found in the lesion of gray brown to yellow brown and slightly sunken, garlic meat is different metamorphic sponge or honeycomb, flap was bud rot, if the sowing, cannot sprout or budding shortly after gradually withered and a large number of seedling shortage. Garlic strains from the rhizosphere to stem often begins to soften deterioration and decay, plants constantly yellowing withered, forming sprout deficiency.
(2) prevention and control measures
The agricultural control after harvest and destroy the timely removal of residual root rot leaf; establish disease-free breeding field, realize the unity of seed and seed. Over 3 years of drought and flood rotation. Find diseased, even to soil dug up and destroyed plants, lime deep.
First, the garlic should be soaked in warm water for 2~3 hours, then the adult will begin to move, then soak for 10~20 minutes with hot water for 50 minutes, turn 2~3 times up and down, the insecticidal effect is good. Also available in 38 DEG C water soaking for 1 hours, and then invested 1% in Formaldehyde Solution, keeping the temperature of 49 DEG C, soak for 20 minutes after the wash with cold water, dry after sowing, can kill the nematodes, but does not prevent germination, or 80% dichlorvos EC 1000 times liquid, soaking for 24 hours, the insecticidal effect of up to 100%.
The chemical control before sowing with warm water and soak for 2 hours after the garlic, with 90% or 80% seed crystal trichlorfon dichlorvos EC 1000 times liquid 24 hours or 2.5% per mu; 1.5 ~ 2 kg trichlorfon powder, plus 30 kg of fine soil, mixed evenly spread into the sowing ditch, then sowing.
At the early stage of the disease, with per mu of 48% chlorpyrifos 800 ~ 1000 times liquid hole irrigation, soil infiltration can cover.
