Survey for Identification and Incidence Evaluation of Groundnut Seed Beetle Caryedon Serratus (Olivier) (Coleoptera: Bruchidae) in Some Localities of Rahad Agricultural Corporation, Sudan
Abstract:
Two surveys were carried out in both seasons 2016/17, on the southern zone and 2018/19, on the northern zone at rahad agricultural corporation (rac). Both surveys covered 12 villages on 6 agricultural blocks, from each block two villages were randomly subjected to survey. The main goal of this work was to identify and investigate the abundance and intensity of incidence of groundnut seed beetle caryedon serratus (olivier) (coleoptera: bruchidae) attacking groundnut in some parts of (rac). A random sample of 100 grams was taken from each village and examined for damage symptoms. The obtained results indicated that; generally, on the southern zone, the mean infestation levels, which include eggs (source of infestation), larvae, pupae, adults and exit holes were 1.7, 8.8, 9.3, 7.3, and 15.7, respectively which were relatively higher when compared with the northern zone 0.5, 3.0, 3.0, 4.5, and 6.2, respectively. Also, the presence of molt due to heavily damaged or broken pods was higher on the southern zone when compared with the northern zone. These results definitely attributed to the clear variations in climatic conditions, which depend mainly on the amount of annual rain fall beside relative humidity. Both of these climatic conditions considered as main factors and directly influenced the level of infestation, if found (increase the population of the bruchid). On the other hand, store hygiene (including the use of insecticides) and proper stock management, beside the presence or absence of the alternative hosts play a fundamental role in the spread of infestation process.
