Assessment of Damage by the Rice Moth, Corcyra cephalonica (81.) on Different Grains at Four Levels of Moisture Content.

Assessment of damage by C.cephalonica on millet, sorghum, milled rice and padi at four moisture contents was determined using the count and weigh method. The parameters determined were percent damaged kernels, percent dry weight loss and dry weight of frass and webbings. The percent survival and the average development period of 12 ± 12 ~hr- old larva to adult were also determined. The four moisture contents used in this study did not influence the percent of damaged kernels, percent dry weight loss or the dry weight of frass and webbings. Rough rice was the least damaged of all the four grains; few larvae survived. The percent of larvae that survived to adult showed an increase from 11.1% MG to 13.2% MG for millet, sorghum and milled rice while at 14.1% MG, it decreased. For milled rice, the percent of larvae that survived at the lowest MG was significantly lower than at the highest MG. The development period in millet, sorghum and milled rice was significantly lower at the lowest MG

Development of the Rice Moth, Corcyra cephalonica (St.) on Different Grains

The development of the rice moth, Corcyra ,cephalonica in millet, sorghum, corn, wheat, padi and milled rice, both as whole.kernels and coarsely ground media, was studied. The parameters observed were:- percentage adults that emerged, average development time from oviposition to adult emergence and the fresh body weight of females. In general, ground kernels of all grains were more satisfactory for rearing C. cephalonica compared to whole kernels. The best all-grain ground and whole kernel media were milled rice and millet, respectively

Ketoksikan Lima Racun Serangga terhadap Larva Kupu-kupu Beras, Corcyra cephalonica St.

The effects of five insecticides namely chlorpyrifos, dichlorvos, malathion, permethrin and pirimiphos- methyl was tested in vitro on the six larval instars of Corcyra cephalonica St. Based on the LCs 0 values, the order of susceptibility of the different larval instars was 2>1>3>4>5>6while for dichlorvos it was 1>2>3>4>5> 6. The order for malathion, permethrin and pirimiphos-methyl was 1>2>3>4> 6>5. The order of relative toxicity of the five insecticides was dichlorvos >chlorpyrifos >permethrin >pirimiphos-methyl >malathion for the second to the fifth instar, while for the first and sixth instar it was dichlorvos >pirimiphos-methyl > malathion for the second to the fifth instar, while for the first and sixth instar it was dichlorvos >pirimiphos-methyl >permethrin >chlorpyrifos > malathion, and dichlorvos > permethrin > chlorpyrifos > pirimiphos-methyl > malathion, respectively. I!.ichlorvos is recommended to replace malathion for the control of certain species of stored preduct pests

Insecticide Resistance in Sitophilus zeamais Mots. and Rhizopertha dominicav (F.) in Indonesia

Fourteen strains of Sitophilus zaemais and fifteen strains of Rhizopertha dominica, collected from rice warehouses andfarmers' storage facilities throughout Indonesia were tested for resistance to malathion and pirimzphos methyl. Two strains of S. zeamais showed a slightly resistant response to malathion, while all strains of this species were susceptible to pirimzphos methyl. Resistance of R. dorninica to malathion was detected in three out of the fifteen strains tested. The predominant species of Sitophilus was S. zeamais

Evaluation of Resistance to Malathion and Pirimiphos Methyl in Strains of Tribolium castaneum (Herbst) collected in Indonesia.

Fifty-six strains of Tribolium castaneum (Herbst) collected from BULOG and commercial godowns of village co-operative units and farmers' padi storage units from many parts of Indonesia were tested for resistance to malathion and pirimiphos methyl. Forty-nine of these strains showed various degrees of resistance while seven showed a susceptible response to malathion. All the strains of T. castaneum were susceptible to pirimiphos methyl. The dominant species of Tribolium spp. in Indonesia was found to be T. castaneum (Herbst)

Diet untuk Pemeliharaan Kupu-Kupu Beras, Corcyra cephalonica St. (Lepidoptera: Pyralidae)

The effects of five kinds of yeast (Brewer, Baker, Torula, Extract and 'ragi tapai) and five kinds of cereal grain (milled rice, corn, groundnut, mungbean and pigeon pea) were determined on the percentage adult emergence, female fresh body weight and the development period of Coreyra eephaloniea St., in order to select a suitable diet for laboratory rearing. A mixture of ground corn and milled rice (1:1) by weight, plus 5% Baher's yeast produces the highest percentage of adult emergence (98), heaviest adult females (26.37mg) and the shortest development period from larval to adult stage (32.9 days). Thus this mixture was selected as the best diet for rearing C. cephaloniea in the labomtory. Information on the following aspect of the biology of C. eephaloniea is discussed: percent Jertility and incubation period of eggs; number of larval instar and its duration; size, weight and pupal duration; and fertility, longevity and ratio of adults