论文部分内容阅读
四带刺蛾(Darna trima)是马来西亚和印尼的一种重要油棕害虫。马来西亚报道过其幼虫有一种致死病毒病。感病幼虫的症状一般表现为停止取食,并从取食处缩回停留在油棕叶羽叶的中脉或基部。感病幼虫腹部颜色由白色变为淡黄色或鲜红色。几天后幼虫死亡,虫体变得浮肿、软化、扭曲、体内物质液化。体表颜色从赭褐色变成暗灰褐色。剖检虫体,內部物质为含有白色小球体物质的浑浊浅暗灰色液体,或为蜂蜜色液体。死后幼虫粘在叶上几个星期。此病是由一种粒状病毒和小的非吸收的核糖核酸病毒的一种混合物所致。
Darna trima is an important oil palm pest in Malaysia and Indonesia. Malaysia has reported a larva has a lethal virus disease. Symptoms of susceptible larvae are generally manifested as stopping feeding and retracting from the feeding site in the midrib or basal part of the leaf of the oil palm leaf. The color of the diseased larvae changes from white to light yellow or bright red. After a few days the larvae die, the parasites become swollen, soften, distort, and the body liquefies. Surface color from dark brown to dark gray-brown. Dissection of parasites, the internal substance is a turbid light dark gray liquid containing white spherules, or a honey-colored liquid. After death, the larvae stick to the leaves for several weeks. The disease is caused by a mixture of a granular virus and a small non-absorbed RNA virus.