ISBN: 9788185874326 - studies on some indian pyralid species of economic importance (records of the zoological survey of india) (2 Ergebnisse)

Zustand: New. pp. viii + 167 Figures, Illus.

Hardbound. Zustand: As New. From the Introduction: "The Pyralid moths constitute an important group of insects in the order Lepidoptera, and comprise several species of great economic importance. There are several well established and well known pest-species like yellow stem borer, top borer, shoot borer, stalk borer, white borer, internode borer, root borer, pod & capsule borer, fruit borer,fruit-tree pests, wax-moth, rice moth, Indian meal moth and number of leaf folders and case worms. The pest species, when increase in population beyond a certain level, in nature, cause serious economic losses to the nation and miseries to the farmers in respect of their own welfare, or even their survival. Several of these well known species occur simultaneously with lesser known pests which, therefore, stand neglected both in respect of their identity and monitoring. Since these species cause a very little loss or damage, these remained practically unknown to agricultural or field entomologists, taxonomically. Besides, even the well known species like top borer, Scirpophaga excerptalis (Walker) in sugarcane, and S. nivella (Fabr.) in rice, had often been confused till very recently. It was only through taxonomic studies that these species were clearly differentiated. Similarly, the other species, yellow stem borer, Scirpophaga incertulas (Walker) has always dominated the field, the males of which resemble closely with males of S. gilviberbis (Zeller) and S. nivella (Fabr.), and have often been confused. The females of these three latter species, are quite different and are easily separable. In.…