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一、棉蝗为害情况广东省东海岛东海林场,于1958年以来营造了大面积的木麻黄防护林,近年来连年发生棉蝗为害,受害面积日趋扩大,1974年为2,000多亩,1978年达3,000多亩。如遇干旱年份,幼、中龄林甚至因此死亡,严重影响了木麻黄的生长。为了弄清棉蝗为害木麻黄的情况,摸索防治措施,我们于1978年到东海进行了初步调查研究,并做了一些防治试验。现将结果整理报道如下:
First, the damage caused by cottonseed locust Donghai Island, Guangdong Province, the East China Sea Forest Farm, since 1958 to create a large area of Casuarina Shelterbelt in recent years, the occurrence of cotton locust infestation, the victim area is expanding, in 1974 was 2,000 mu, up to 3,000 in 1978 Mu. In case of drought years, young and middle-aged forests even died, seriously affecting the growth of Casuarina. In order to clarify the cotton locust harmful wood ephedra situation, to explore prevention and control measures, we conducted a preliminary investigation in the East China Sea in 1978, and made some control experiments. The results are now reported as follows: