Volume 9 No. 3 July – September 1987

I.K. Pai, S.N Hegde and N.B Krishnamurthy ABSTRACT Paraaminobenzoic acid (PABA) at 50, 100, 200 and 400 ppm concentration were administered to third instar larvae of silkworm (Bombyx mori L.) by leaf dip method. Results showed marked improvement of the silk percentage at low concentrations of 50-100 ppm. The use of appropriate PABA concentrations in …

Note: Use of Paraaminobenzoic Acid to Improve Yield of Silkworm (Bombyx mori L.) Read More »

Corazon B. Batoy, Josephine F. Sarmago and Bernadita C. Pilapil ABSTRACT Breeding activity of the blue crab Portunus pelagicus (L.) was found to be continuous all throughout the year with peak periods during the first and last quarters of the year. Fluctuations in gonad indices of males and females do not necessarily follow the same …

Breeding Season, Sexual Maturity and Fecundity of the Blue Crab, Portunus pelagicus (L.) in Selected Coastal Waters in Leyte and Vicinity, Philippines Read More »

Crisanta E. Sajise and Lina L. Ilag ABSTRACT The incidence of aflatoxin contamination in cassava roots at different stages of maturity and during processing and storage was determined. No aflatoxin was obtained from 7- to 14- month old cassava roots. During storage, however, trace amounts of aflatoxin B1 were observed in stored cubes but not …

Incidence of Aflatoxin Contamination in Cassava (Manihot esculenta Crantz) Read More »

Erlinda A. Vasquez, Emiliana N. Bernardo and Ma. Flerida A. Carino ABSTRACT The contact toxicity of decamethrin and permenthrin was evaluated on adult black bean aphids. (Aphis craccivora Koch) and third instar larvae and aults of its coccinellid predators. Chilomenes sexmaculata Fabr. and Coleophora inaequalis Fabr. Based on LC50 , decamethrin is more toxic to …

Contact Toxicity of Decamethrin and Permethrin on Black Bean Aphid and Two of Its Coccinellid Predators Read More »