University of Khartoum

Grasshoppers (Orthoptera: Acridoidea) Incidence and Effects on Cereal Crops in Southern White Nile Area.

Grasshoppers (Orthoptera: Acridoidea) Incidence and Effects on Cereal Crops in Southern White Nile Area.

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Title: Grasshoppers (Orthoptera: Acridoidea) Incidence and Effects on Cereal Crops in Southern White Nile Area.
Author: Mubark Zaroug, Khlafalla
Abstract: It was found necessary for studying the incidence of grasshoppers in the area related to work with the known survey methods, the Visualized Square Meter Count (VSMC) and the Net Sampler (NS) method and to evaluate them for their efficiency in such work. The (VSMC) gave significantly higher counts than the (NS) method. Light trapping gave further evidence on the occurrence and importance of grasshoppers in the study areas and the catches were influenced by both wind speed and moon phases. High wind speed and full moon are associated with lower catches. Within the study area and with the help of the above mentioned techniques to monitor grasshopper, 79 species have been collected and identified under the families, Pyrgomorphidae and Acrididae. Some of them are very important as pests on sorghum, millet and sugarcane. To assess the damage in sorghum and millet crops at both seedling and milky stages of growth caused by grasshoppers, the technique of comparing the crops naturally infested and uninfested was used. The results obtained showed that the mean differences of the protected and unprotected plots were highly significant in the two crops at both stages of growth. Also studies to find relationships between the density of grasshoppers /M2 and % of damage in each seedling and milky stages of both sorghum and millet crops were made. Regression equations in % of damage in seedling and % reduction of weight of milky grain heads of sorghum crop in relation to different levels of infestation were fitted.
URI: http://khartoumspace.uofk.edu/handle/123456789/15164
Date: 2015-06-25


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