نيماتودا الجذور في الذرة
يصاب الذرة بعدد من النيماتودا التي تسبب ضعف وتقصف الجذور أهمها (stubby-root Trichodorus spp., root-knot Meloidogvne spp., sting Belonolaimus longicaudatus)
ويتم مكافحة المرض باستخدام المبيدات النيماتودية التي توضع مع الحبوب اثناء الزراعة.
stubby-root Trichodorus spp., root-knot Meloidogvne spp., sting Belonolaimus longicaudatus)
Stubby-root (Trichodorus spp.) causes poor root growth and stunting. Roots appear stubby due to nematode attack of growing point which inhibits cell division and elongation. Secondary branching behind root tip often gives a brush effect since these root-tips are also injured shortly after development. Symptoms are often confused with injury caused by other nematodes, herbicide residues and acid soil.
Root-knot (Meloidogyne spp.) injury is difficult to distinguish from that of other nematodes since galls may be absent or less evident than in more susceptible hosts. Meloidogyne incognita and M. arenaria are frequently associated with root injury and poor growth. The latter seems more likely to produce detectable galls.
Sting (Belonolaimus Iongicaudatus) nematodes are more common to deep sand type soils. Root injury and growth inhibition are usually more drastic than with other nematodes. Note severe reduction of root system and lack of feeder root development