2. Institutional Publications
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Item Wilt disease of betelvine in Kerala caused by root knot nematod(Kerala Agricultural University, 1974) Mammen, K VItem Meloidogwe javanica (Treub, 1888) Chitwood, 1949 and Hoplolaimus indicus, Sher, 1963 associated with sugarcane in Kerala(Kerala Agricultural University, 1974) Mammen, K VItem Taxonomic key for the identification of Indian delphacidae(Kerala Agricultural University, 1974) Mammen, K V; Menon, M R GItem White tip nematode of rice in Kerala(Kerala Agricultural University, 1975) Mammen, K VItem Biology of the brown plant hopper, nilaparvata lugens (stal) (delphacidae, hemiptera)(Kerala Agricultural University, 1975) Nalinakumari, T; Mammen, K VItem On the occurrence of Coccinella Arcuata fabricius (Coleoptera:Cocci nellidae) as a predator of rice thrips in Kerala(Kerala Agricultural University, 1977) Mammen, K V; Vasudevan Nair, K PItem Influence of climatic factors on populations of the brown plant hopper in Kuttanad, Kerala(Kerala Agricultural University, 1980) Nair, K P V; Mammen, K V; Pillai, K B; Nair, S SStudies carried out at the Rice Research Station, Moncompu, Kerala, during 1974-76 showed that in the Kuttanad rice tract, brown plant hopper Nilaparvata /ugens (Stal.) is present in the field throughout the year with a major population peak during January to March for themain crop (winter crop) and a minor peak during August to September for the second crop {autumn crop). Correlation studies revealed that the hopper population was significantly influenced by climatic factors. Rainfall in association with relative humidity and and maximum temperature played a decisive role in regulating the population of the insect.Item On the occurrence of white grub Schizonycha Ruficollis F. (Melolonthinae Scarabaeidae Coleoptera) as a pest of sugarcane in Kerala(Kerala Agricultural University, 1981) Mammen, K VItem Control of major pests of copra with phosphine fumigation(Kerala Agricultural University, 1998) Nalinakuinari, T; Visalakshi, A; Mammen, K VItem Varietal preference, growth and development of pests necrobia Rufipes de geer and oryzaephilus surinamensis linn, in stored copra(Kerala Agricultural University, 1998) Nalinakumari, T; Mammen, K VCopra is subjected to the attack of various insect pests during storage. Necrobia rufipes De Geer and Oryzaephilus surinamensis Linn, were found to be the most important. The varieties / cultivars tested were Chavakkad Dwarf Orange x West Coast Tall, Laccadive Micro, Gangaboridam, West Coast Tall x Chavakkad Dwarf Orange, Chavakkad Dwarf Orange, West Coast Tall, Laccadive Ordinary, West Coast Tall x Chavakkad Dwarf Green and Chavakkad Dwarf Green. Data on larval period, larval mortality, Chavakkad Dwarf Green. Data on larval period, larval mortality, pupal period, pupal mortality, percentage of adult emergence, adult longevity and the fecundity of the beetles and incubation period of the eggs were recorded daily after releasing one day old larvae of the insects in these varieties. The growth index of the insects in each treatment was calculated by dividing the percentage of adult emerged with the mean number of days for adult formation. Studies conducted revealed that the severity of infestation varied with varieties and the growth index varied with respect to larval period, larval mortality, pupal period, pupal mortality, adult emergence, adult longevity and fecundity. In overall assessment of the study, CDO x WCT, LM and LO were identified as less desirable for keeping the population build up low, while CDG and WCT x CDG were better and the remaining varieties were found to be intermediate.