2 INTRODUCTION Cowpea (Vigna unguiculata L. Walp) originated from Africa where a large number of primitive cultivars and semi-wild forms are found (Kwaifa et al., 2012). Callosobruchus maculatus has a karyotype of ten chromosome pairs (2N=20) ().Chromosome 10 is a sex chromosome and males are the hetergametic sex (Figure 3). The quality deterioration was determined by proximate analysis of the grains at one, two and three months. Abstract The effect of time of harvest on the level of damage caused by Callosobruchus maculatus on cowpea was studied. (Rutaceae) root bark powder when compared to neem seed powder and pirimiphos-methyl. The full text of this article hosted at iucr.org is unavailable due to technical difficulties. Please check your email for instructions on resetting your password. The bruchid, Callosobruchus maculatus commonly known as common bean weevil is an important pest of stored cowpea, Vigna unguiculata Walp. BRS Tapaihum and BRS Acauã cultivars showed the lowest cumulative insect emergence and instantaneous rates of population growth, and the highest insect mortality, mainly when the grains were obtained from plants inoculated with rhizobial strains. Ten varieties of cowpea grains were infested with Callosobruchus maculatus. The damage caused by Callosobruchus maculatus on cowpea grains is dependent on the plant genotype Elida Barros Torres Crop Sciences Department, Federal University of Piauí, Campus Professora Cinobelina Elvas, Bom Jesus, Piauí, Brazil The insect census taken at one, two and three months showed a progressive increase in insect population from one month to three months. The damage caused by the bean bruchid, Callosobruchus maculatus (Fabricius) on eight different legume seeds on sale in Awka and Onitshamarkets in Anambra State, … The damage caused by the bean bruchid, Callosobruchus maculatus (Fabricius) on eight different legume seeds on sale in Awka and Onitsha markets in Anambra State, Southeastern Nigeria, were studied between January and April, 2008. with Zanthoxylum zanthoxyloides (Lam.) If you do not receive an email within 10 minutes, your email address may not be registered, Callosobruchus maculatus was maintained on the cowpea cultivars and biological activities such as oviposition, adult emergence, percentage seed damage, and weight loss were monitored. Registered in England & Wales No. This was to determine the level of quality deterioration of the cowpea varieties caused to the grains by the insects. Males copulating for the sixth time in succession inflicted greater levels of genital damage, but transferred smaller ejaculates in comparison with virgin males. These weevils cause loss of quality, quantity and seed viability. Epub 2016 Apr 5. Learn about our remote access options, Crop Sciences Department, Federal University of Piauí, Campus Professora Cinobelina Elvas, Bom Jesus, Piauí, Brazil, Agricultural, Environmental and Biological Sciences Center, Federal University of Recôncavo da Bahia, Cruz das Almas, Bahia, Brazil, Embrapa Semiárido, Petrolina, Pernambuco, Brazil, Agronomy Department, UNESP, Campus de Ilha Solteira, Sao Paulo, Brazil. Enter your email address below and we will send you your username, If the address matches an existing account you will receive an email with instructions to retrieve your username, By continuing to browse this site, you agree to its use of cookies as described in our, I have read and accept the Wiley Online Library Terms and Conditions of Use. The control samples had higher carbohydrate than the infested ones. Thirty seven to 60% of the seeds may The percentage ash in the control was higher than the infested, and it decreased with storage period. It … The insect census taken at one, two and three months showed a progressive increase in insect population from one month to three months. ... Enzymes with the potential to damage peritrophic membranes and gel, such as chitinase, have been associated with plant defense systems. The male possesses penile spineswhich damage the female reproductive tract. Beans from cowpea cultivars fertilized with mineral N or inoculated with various rhizobium strains may contain different nitrogen concentrations and nitrogen metabolite composition, which affects the beans' defense mechanisms against pests. The female may forcefully kick the male during copulation, ending the mating. We use cookies to improve your website experience. One Mendelian trait has been described for bean beetles, body color which is autosomal and has alleles with incomplete dominance ().Heritable variation in body size is well described (Fox et al. The control had a higher percentage fat than the infested, but the fat decreased with storage period. The total protein in the control experiment showed a progressive decrease with increase in storage period. The damage caused by Callosobruchus maculatus on cowpea grains is dependent on the plant genotype J Sci Food Agric. 3099067 The percentage carbohydrate however, decreased with increase in storage period. Soybean seed coat chitinase as a defense protein against the stored product pest Callosobruchus maculatus. By closing this message, you are consenting to our use of cookies. Only in rare cases can field infestations soon … Suppression of seed bruchid (Callosobruchus maculatus F.) development and damage on cowpea (Vigna unguiculata (L.) Walp.)

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