University of Khartoum

Studies on Some Aspects of The Biology, Ecology and Control of the Dura Stalk Borer, Chilo Partellus (Swinioe) (Lepidoptera: Pyralidae), in the Sudan.

Studies on Some Aspects of The Biology, Ecology and Control of the Dura Stalk Borer, Chilo Partellus (Swinioe) (Lepidoptera: Pyralidae), in the Sudan.

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Title: Studies on Some Aspects of The Biology, Ecology and Control of the Dura Stalk Borer, Chilo Partellus (Swinioe) (Lepidoptera: Pyralidae), in the Sudan.
Author: Nasr EL Din Mohammed Nasr EL Din, Nasr EL Din; Nasr EL Din Mohammed Nasr EL Din, Nasr EL Din
Abstract: Some aspects in the biology, ecology and control of dura stalk borer, Chilo partellus were investigated in the laboratory and in the field. C. partellus is found to be the major best of dura grown as forage crop in and around Khartoum, while the noctuid, Sesamia cretica, hitherto considered as the main pest of maize and dura, hardly constituted two per cent of the total borer population in this area. C. partellus is considered as one of the major limiting factors in seed production of dura. The extent of damage caused by C. partellus to forage crops was considerable. Heavy loss of shoots as a result of dead-hearting by the borers was noticed early in the season. When the plants are grown the larvae feed in the leaf funnel and later bore into the internodes resulting often in lodging. The cumulative effect of the activity of the borers throughout the growth of the crop was always reflected in the yields. When the infestation was heavy the production of grains was reduced to nil. The breeding of C. partellus in Khartoum was not cyclic. All the stages were met with in the field at the same time showing considerable overlapping of generation. Light-trap catches of adults have shown that the moths were active during winter months and thus the infestation of successive crops was through the stages of borers present in the same field. The fecundity potential of C. partellus, studied for the first time, both by dissection as well as by oviposition showed that the female was capable of laying on an average 380 eggs. The presence of a resting stage diapausing larvae in stubbles, probably induced by the dry conditions in the summer months, was observed among the populations of Chilo larvae, during the months January-March. The effect of relative humidity on the pupae has shown that humidity below 50 per cent adversely affected the emergence of moths. Host preference studies indicated that sorghum vulgare var. Abu Sabin was the most susceptible among the cultivated graminaceous crops in Shambat. One larval parasite (Vipio deesae), two pupal parasites (Hyperchalalcidea soundanensis and Pediobius sp.) and a microbial disease were recorded, parasitizing the different stages of C. partellus. Field evaluation of the toxicity of 4 common insecticides – Endrin (0.1 and 0.075 per cent), DDT (0.3 and 0.4 per cent), Sevin (0.3 and 0.4 per cent) and Thuricide (50 000 spores/acre and 75 000 spores/acre) at two different concentrations indicated that Endrin, DDT and Sevin decreased the number of dead hearts in treated plots. Further, one and two applications of sevin were more effective in reducing borer populations than three applications. Thuricide was the least effective of the insecticides tested. Control considerations in the light of present studies are discussed and some future lines of work are suggested.
URI: http://khartoumspace.uofk.edu/handle/123456789/15920
Date: 2015-07-06


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