G05
Storage Pests and Control
451 Abdel-aal, Y.A.I.; Hussein, M.H. Adult emergence and survival of the cowpea seed beetle Ca/Iosobruchus maculstus exposed as eggs to the hormonoid altosid. Zeltschrift fur Angewandte Entomologie, 95(1): 30-33. 1983.
susceptible. The data Indicate that resistance to bruchlds In cowpea Is controlled by two recessive genes for which symbols rcm1 and ran2 are being proposed.
Under normal conditions and after Altosid treatment of one and three day old eggs of CalJosobruchus msculatus, survival and adult emergence were examined. Data obtained showed that this juvenile hormone analogue reduced significantly the adult emergence and the higher the concentration the higher the reduction in survival. It was quite clear that the compound was more potent when applied to newly laid eggs, particularly, at higher concentrations.
453
452 Adjadi, 0.; Singh, B.B.; Singh, S.R. Inheritance of bruchid resistance in cowpea. Crop Science, 25(5): 740742. 1985. TO indicate the nature of Inheritance of resistance to bruchlds (C.a tlosobruchus macufatus F.) In cowpea, F1, F2, and backcross populations involving three resistant and two susceptible parents were bioassayed in the laboratory for bruchid reaction on an individual plant basis. The reaction of F1 seeds was similar to that of seeds from the maternal parents Indicating that the genotype of the maternal plant controls bruchld infestation. The F2 seeds derived from F1 plants represented the true hybrid population and the mean adult emergence was similar to that of the susceptible parents, indicating complete dominance of susceptibility. No reciprocal differences were observed. The F2 plants derived from the six crosses segregated into a ratio of 15 susceptible : 1 resistant, indicating digenlc Inheritance. These results were further supported by the backcross data. The F1 plants from the backcross Involving the resistant parent segregated Into a 3 susceptible: 1 resistant ratio, whereas those Involving the susceptible parent were uniformly
Aguiar, P .A.A.; Moraes, G.J. de. Arrnazenamento de caupl a nivel de fazenda [Storage of cowpea under farmers' level]. Pesqulsa Agropecuarla Braslleira, 18( 1): 59. 1983.
Cowpea seeds were stored with a slight weevil (CaJ/osobruchus maculstuB) infestation (1.5-3%) for a twelve-month period, under low humidity and high temperature In the northeast Brazil. Amianthus box with sand cover, metallic bin sealed wHh bee wax, subterraneous bin with plastic covering. jute sack with seeds sprayed with corn oil and jute sack were used as containers. A great attack of the weevil In jute sacks during the storage period was detected while the other containers offered a good protection against the pest attack, mainly In the amlanthus box with sand cover. 454
Dick, K.M.; Credland. P.F. Egg production and development of three strains of Callosobruchus msculalus (F.) (Coleoptera: bruchidae). Journal of Stored Products Research. 20(4): 221-227. 1984.
The numbers of eggs laid by Individual females of three geographically Isolated strains of C. maculatus (F.) on different numbers of cowpeas were counted. Females of strains originating in the Yemen and Brazil laid about 40 eggs when provided with a Single cowpea. whilst females of Nigerian strain laid 75. Given 40 cowpeas, females of all three strains laid between 80 and 90 eggs. Only one or two adults of the Yemen strain emerged from cowpea Irrespective of the initial number of eggs present, compared with the ten or more
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