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V.A. Vijayan and N.B. Krishnamurthy ABSTRACT Sensitivity of three Drosophila species namely D. melanogaster, D. nasuta nasuta and D. sulfuricaster neonasuta to two cyclic hydrocarbons, namely: Dithranol (1, 8, 9-trihydoxy anthracene), and 2,4-dichloro-1-naphthol was studied. Dithranol at 500, 750 and 1000 ppm and 2,4-dichloro-1-naphthol at 100, 150 and 200 ppm were administered to the larvae …

Note: Differential Sensitivity of Three Species of Drosophila to Two Cyclic Hydrocarbons Read More »

Antontio I. Padaoil Jr. and Reynaldo R. Javier ABSTRACT Height of stylo plants at first and second cuttings significantly increased upon application of 300 kg/ha rock phosphate (103.71 kg P2O5). Fresh herbage yield also increased when 100 to 400 kg/ha of rock phosphate was applied. Total fresh herbage and dry matter yields of Stylo applied …

Effect of Varying Levels of Rock Phosphate on the Growth and Yield of Stylo (Stylosanthes guyanensis Aubl.) Under Acidic Soils Read More »

Arsenio D. Ramos and Nestor M. Gloria ABSTRACT Percentage weight loss of abaca seedpieces placed in jute sacks and stored in a well-aerated nipa hut was higher than those covered with fresh banana leaves and stored in shaded field. These methods did not significantly affect percentage emergence, number of functional leaves per plant of 4-month …

Effects of Method and Duration of Storing Seedpieces on Shoot Emergence and Growth of Abaca Read More »

Alfredo B. Escasinas and Murray J. Hill ABSTRACT Maize hybrid D54 seeds were used to determine the effect of processing on stress cracking and the relationship between stress cracking in artificially dried seeds and loss of seed viability after storage. Considerable stress cracking occurred during the seed drying stage of processing. Some cracks significantly reduced …

Stress Cracking in Maize (Zea mays) Seeds Read More »

K.M. Kuruvilla, Y.S. Chauhan, G. Das and J.S. Kharbteng ABSTRACT Both germination and tube growth of Solanum sisymbrifolium Lam. Pollen require an optimum temperature of 25°C and a growth medium containing 100 ppm boric acid, 10% sucrose and 0.6% Bacto-agar. Pollen germination was stimulated by 5 and 10 ppm GA3, 1-10 ppm kinetin, 1 ppm …

Effect of Different Factors on Germination and Tube Growth of Solanun sisymbrifolium Lam. Pollen Read More »

Loida Z. Nasayao ABSTRACT Dwarf coconut populations, namely: Orange Dwarf (OD), Coconino (CCN), Lingkuranay (LKY) and Tacunan (TAC) were pollinated by controlled hand pollination technique with Baybay Tall (BAY) as the common male parent to study the hybrid vigor of the resulting hybrids. Compared with their corresponding female parents, seedlings of OD x BAY, CCN …

Germination and Seedling Performance of Some Selected Coconut Hybrid Crosses Read More »

Tessie C. Nuñez ABSTRACT Sporad formation and pollen fertility were studied in nine local cococut cultivars. Varying frequencies of abnormal sporads such as dyads, triads, pentads, hexads and heptads were observed. Normal sporads (tetrads) occurred highest in Lingkuranay (99%) and lowest in Coconino (58%). Pollen fertility ranged from 66% (Coconino) to 96% (Baybay Tall). Significant …

Sporad Formation and Pollen Fertility of Nine Local Coconut Cultivars Read More »