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30th September acid Advisory analysis April area under rubber assessment bark consumption Board's nurseries Bordeaux mixture brown bast budded plants budded stumps budwood cess clonal seedlings co-operative societies collected compared continued cover crops Dieldrin different clones disease Division drainage area estate mother tree Experiment Station Factorial Experiment fertiliser flow pattern girth increment girth measurements growth Hand Pollinated Hectares India isolate Kaduthuruthy Kerala Kottayam latex leaf retention licences Loan Scheme Manjeri Metaldehyde method Mundakayam Nagercoil natural rubber nitrogen NPK Mg observations oospores Parakode pericarp period under report period under review petiole Phytophthora Phytophthora palmivora planting materials popular clones potash rate of bark Regional Nurseries replanting Research RRII RRIM clones Rubber Board Bull Rubber Growers samples Section seeds Seminar showed slugs small growers Small Holders Smoke Houses soil sole crepe sporangia spraying Studies supplied synthetic rubber systems of tapping TABLE Thodupuzha Tjir tonnes trial