Pesticide Applications for Controlling Cucumber Root-knot Nematode

Using different pesticides,effect of controlling the cucumber root-knot nematodes was studied.The efficacy and residue toxicity of the pesticides were evaluated.The results showed that,when only one single application was applied during the cucumber growth period,(a) the control had a disease index of up to 66.67,while veratridine and phoxim had 46.67 and 40,respectively;(b) for azadirachtin,azadirachtin+phoxim or veratridine+phoxim,the disease index was low,but the preventive performance was good;(c) for azadirachtin+phoxim,the maximum preventive effect was 54%,and a significant synergy existed(at P0.05 level);and,(d) all pesticides tested showed varying degrees of improvements on productivity,even the least effective one,veratridine,increased cucumber yield by 19.98%.