Rubber Science

PHOSPHORUS DISSOLUTION PATTERN OF DIFFERENT ROCK PHOSPHATES AND ITS INFLUENCE ON BIOMASS PRODUCTION AND NODULATION OF PUERARIA PHASEOLOIDESResearch Articles
Pages 118 - 122
Anna Varghese, M. Karthikakutty Amma & M. Mathew
- Abstract
- Keywords
Dissolution of four indigenous rock phosphates in comparison with an imported (Jordan) material was studied in an acid soil from rubber growing tract under field capacity for a period of ten weeks. Significant increase in Bray Extractable P was obtained for all the treatments. Dissolution of imported (Jordan) rock phosphate was the highest followed by that of Mussoorie rock phosphate. Rock phosphates from different geographical regions differed in their effect on dry matter yield and P uptake of Pueraira phaseoloides. Among the Indian sources, Mussoorie rock phosphate was the most effective for Pueraria phaseoloides and it was on par with imported rock phosphate. The relative agronomic effectiveness of the different sources of rock phosphates followed the order- Jordan, Mussoorie, partially acidulated Maton, Purulia, Udaipur, Maton.

Pueraria phaseoloides, Indigenous rock phosphate, Phosphorus dissolution pattern

APPLICATION OF ENTOMOPATHOGENIC FUNGUS BEAUVERIA BRONGNIARTII FOR MANAGEMENT OF CHAFER BEETLE OF THE WHITE GRUB HOLOTRICHIA SERRATA INFESTING RUBBER SEEDLINGSResearch Articles
Pages 123 - 125
C. R. Nehru, K. Jayarathnam & G. K. Karnavar
- Abstract
- Keywords
The infectivity of the entomopathogenic fungus Beauveria brongniartii to adult beetles, which are responsible for the abundance and distribution of white grubs (H. serrata) in rubber nurseries, is reported. Longevity of the adult beetles of both sexes infected with B. brongniartii was significantly Jess than that of the uninfected ones. The results indicated that B. brongniartii spreads from contaminated adults to healthy ones through mating contact. Release of the contaminated adults in the nursery was effective for biological suppression of H. serrata.

Rubber nurseries, Holotrichia serrata, Beauveria brongniartii

A SOIL ACTINOMYCETE ANTAGONISTIC TO CORTICIUM SALMONICOLOR CAUSING PINK DISEASE OF RUBBERResearch Articles
Pages 126 - 130
Kochuthresiamma Joseph, R. Kothandaraman, Jacob Mathew & K. Jayarathnam
- Abstract
- Keywords
Actinomycetes from the rhizosphere soils of five clones of rubber were tested against Corticium salmonicolor, the pathogen causing pink disease on rubber. One of the isolates had an inhibition zone of 40 mm when tested in agar medium and caused lysis of the mycelium upto a distance of 20 mm from the inoculated point, in 72 h. Sterile rubber twigs treated with the actinomycete also prevented the growth of C. salmonicolor. The actinomycete was found to survive in the bark of rubber tree for one month under field conditions. Application of actinomycete broth culture on infected trees indicate promise in controlling pink disease.

Hevea brasiliensis, Pink disease, Corticium salmonicolor, Biological control, Actinomycete, India

FIELD EVALUATION OF SOME NEWER INSECTICIDES AGAINST BARK FEEDING CATERPILLAR AETHERASTIS CIRCULATA INFESTING RUBBERResearch Articles
Pages 131 - 133
K. Jayarathnam, C. R. Nehru & V. T. Jose
- Abstract
- Keywords
Effectiveness of five insecticidal dusts (carbaryl, fenvalerate. HCH, methyl parathion and quinalphos) was evaluated against the bark-feeding caterpillar, Aetherastis circulata Meyr. feeding on the bark of Hevea brasiliensis. All the insecticidal applications were significantly superior to control. Fenvalerate, methyl parathion and quinalphos proved to be more effective in relative performance. The most effective and low toxic fenvalerate is recommended for the control of this pest.

Hevea brasiliensis, Pest control, Aetherastis circulata, Fenvalerate, Methyl parathion, Quinalphos, India

ECOLOGICAL IMPACT OF RUBBER (HEVEA BRASILIENSIS) PLANTATIONS IN NORTH EAST INDIA: 2. SOIL PROPERTIES AND BIOMASS RECYCLINGResearch Articles
Pages 134 - 141
A. K. Krishnakumar, Chandra Gupta, R. R. Sinha, M. R. Sethuraj, S. N. Potty, Thomas Eappen & Krishna Das
- Abstract
- Keywords
Influence of rubber and teak plantations and natural forest on soil properties, nutrient enrichment, under-storey vegetation and biomass recycling has been studied in the Siliguri sub-division (Darjeeling district) of West Bengal. The study indicates that rubber, teak and natural forest had comparatively high input of organic carbon enriching the soil. Teak had the highest organic matter content in the surface layers. However, the depletion of organic carbon with depth was the highest for teak and the least for natural forest, depletion pattern for rubber being close to that of natural forest. The water retention characteristics showed that soil under rubber had the highest volumetric water content at field capacity (-0.033 MPa) and also at -1.5 MPa. The results suggest that the depletion of sub-surface soil moisture would be less under rubber than teak. The soils under teak showed a higher calcium content in the surface layers. The distribution of available nutrients otherwise did not show much variation in the soils under rubber, teak and natural forest. Biomass and floor accumulation revealed luxurient under-storey vegetation under all the three conditions. The data on floor accumulation showed that litter accumulation under rubber was lower than that of teak and natural forest which could be attributed to a faster rate of decomposition under a higher moisture regime and higher available nutrient. The study establishes ecological desirability of rubber in terms of habitat diversity, soil physical properties and nutrient recycling.

Ecological impact, Rubber plantation, Soil properties, Biomass, North East India

EFFECT OF FUNGAL ANTAGONISTS ON PHELLINUS NOXIUS CAUSING BROWN ROOT DISEASE OF HEVEAShort Scientific Reports
Pages 142 - 145
C. Kuruvilla Jacob, Annakutty Joseph & K. Jayarathnam
- Abstract
- Keywords
.

.

Digital library

Volume 04, Number 2, (December 1991) Articles 7 - 12