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“牧草之王”苜蓿,也和其它有机体一样,不断遭受到病虫的侵袭。潜在的,毁灭性的,最难于防护的虫害之一就是线虫。这种土壤里生长的人眼难以看见的小虫能够侵袭和破坏植物的机能,导致植株倒伏、生长缓慢,最终造成减产。一、症状线虫为害的植株地上部分的表现为发育缓慢和褪绿,并引起缺水、缺素症状。这种症状一般都单个发生,引起一小片土地上的植株黄绿,生长受阻。炎热阳光下叶片枯萎或变褐,但只要不是特别严
Alfalfa, the king of pasture, is also under constant attack by pests, just as any other organism. One of the potential, devastating and hardest pests is the nematode. Insects that are invisible to human eyes growing in this soil can invade and destroy plant functions, causing the plants to lodge, grow slowly, and eventually lead to reduced production. First, the symptoms of nematode-harmed plants on the part of the performance of slow growth and chlorosis, and caused by water shortage, deficiency symptoms. This symptom usually occurs singly, causing yellowish-green plants on a small piece of land, obstructing growth. Leaves withered or browned in hot sunshine, but not particularly severe