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东台市历年种植荷藕350多亩,1992年90％以上受龙虾为害。据6月30日调查,受害严重的田块,破叶率达83.3％(基本未受害的田块有荷叶21张/米~2),每平方米有龙虾1.1—1.5头(每公斤70多头左右),估计全市受龙虾为害损失荷藕18.37万公斤。龙虾为害严重原因:(1)1991年特大洪灾,全市藕田被水淹浸,龙虾移居藕田生存;(2)当年蔬菜丰收,大量丢弃的残次品和剩叶施入藕田,使龙虾食料充足大量繁殖。 防治:(1)利用藕田去水后龙虾隐藏于浮叶下面,用其习性人工捕捉。(2)用2.5％敌杀死4000—5000倍,亩用药液500公斤,田间保持薄水层泼浇。
Dongtai over the years planting lotus root 350 mu, more than 90% of 1992 by lobster damage. According to the survey on 30 June, severely damaged plots had a leaf breaking rate of 83.3% (lotus leaf 21 leaves / m ~ 2 basically untouched) and 1.1-1.5 lobster per square meter (per kilogram 70 Long or so), it is estimated that the city suffered a loss of lotus root lobster 183,700 kg. Lobster detrimental to the serious reasons: (1) 1991 extraordinary floods, the lotus lotus was flooded in the city, lobster immigrated lotus fields to survive; (2) when the harvest of vegetables, a large number of discarded defective products and the left leaves into lotus fields, the lobster Adequate breeding large enough food. Prevention: (1) After using Lotus to loach water hidden under the floating leaves below, with its habitual artificial capture. (2) Kill 4000-5000 times with 2.5% enemy and 500 kilograms of medicinal liquid, keep thin water pouring in the field.