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DAMAGE ASSESSMENT CAUSED BY RODENTS TO SOME FIELD CROPS IN UPPER EGYPT.

The present study was carried out in fields located in al-Azhar University farm in Assiut district to determine the damage in broad bean, wheat, maize and sorghum which caused by the rodent species and the time during which damage reaches its maximum. Samples were taken at five distances from the outer field border (1.0, 10.0, 20.0, 30.0 and 40.0 meters). The results showed that rodents attack broad bean plants from 15 January to 20 March. The highest attack by rodents was recorded during the period of the pod filling stage. The lowest damage recorded during the period from 15 to 30 January. The damage was concentrated in the broad bean plants adjacent to the field border, then decreased progressively towards the middle of the field. The lowest attack was presented in plants situated at 40 meters from the field border. Rodent attack the wheat plants from 1 April to 20 May and the maximum attack was recorded during the period in the doughy stage. During the period from 1 to 8 April through the milky stage the lowest damage in wheat plants was recorded. Damage decreased gradually towards the center of the field. The highest destruction was recorded at the field border followed by the ten meters beside the field border. The lowest damage was registered at 40 meters apart from field borders. Rodents attack maize plants from the period of 15 September till 20 October and the maximum attack was observed during the period from 13 September to 20 October. The greatest damage was concentrated in the plants near to the field border and in the first ten meters beside the field borders and lowest damage was presented in the distance more than 10 meters far away from field borders. Rodents attack the sorghum plants from 15 September to 21 October. The highest damage was clear in the plants near of the field borders and with increasing distances. The damage was gradually tended to reduce. The minimum rodent of damage was presented in plants situated at 20-30 meters from the field border.