Browsing by Author "Remamony, K S"

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Acrocercops zygonoma meyrick as a pest of Mango in Kerala
(Kerala Agricultural University, Vellanikara, 1968) Remamony, K S; Das, N M; Nair, M R G K
Bioecology and life-tables of the pea aphid (Aphis Craccivora Koch. ) and its natural enemies
(Department of Agricultural Entomology, College of Agriculture, Vellayani, 1995) Reji Rani, O P; Remamony, K S
The seasonal distribution of pea aphid Aphis craccivora and its predators on twigs and pods of cowpea and a perennial alternate host of the insect, glyricidia were assessed during 1993 – 94 at the College of Agriculture, Vellayani, Kerala. On cowpea peak population of the pest during the first season, on twig and pods were noted in January / February while on glyricidia two peaks were noted in the season first from December and early February and the next from February to end to early March. In the second season also one peak period each were seen on twigs and pods of cowpea and on glyricidia, but the three did not coincide in the periods of occurrence. In glyricidia a fourth peak was observed in August / September 1994. Studies thus revealed vital indifference in the trend of population build up on cowpea and glyricidia and even on the twigs and pods of the same plant. The growth stages of the crops and their nutritive status are suggested as the major factor influencing the population build up of A. craccivora than any other factor in the ecosystem. Survey of natural enemies in the region revealed the occurrence of six predators and one insect pathogen. Among them C. sexmaculata and x. scutellare were found to be the important ones. A pest dependent increase in the population of predators were observed but the trends of the population build up of the pest and the natural enemies did not show any effective role of the predators in suppressing the pest population under field condition. The detailed biology of A. oraccivora and the two predators were studied in the laboratory conditions. The duration and percentage survival of each larval instar, adult longevity and fecundity were studied and the data indicated that short duration and higher fecundity od A. craccivora when compared to predators account for the successful establishment of the pest in field even with higher levels of predator population. The parameters of biology in laboratory were found more favourable for the population of X. scutellare than for C. sexmaculata. But in field latter was more successful. Feeding potential of C. sexmaculata ( larvae and adult) was much higher than that X. scutellare (larvae) only. Hence C. sexmaculata was found to be a better bicontrol agent for the control of A. craccivora. The exhaustive information gathered will be useful in cinstructing models for integrated pest control programmes of A. craccivora. Age specific life-tables were consctucted for A. craccivora for assessing the intrinsic rate of increase and germination time of pest and these were found suitable for fast population build up. Life tables were prepared during, December 1993 and January 1994 and the ‘Generation survival’ and ‘Trend Index’ were found increasing in January. The lower mortality percentage of the late instar nymphs were found as the reason for the variations. But the mortality factors could not be precisely determined in the investigations. Series of such life tables developed for different seasons, hosts and different ecosystems may be necessary for constructing suitable models for integrated pest management practices.
Biology of Anarsia epotias Meyr. (Lepidoptera: Gelechiidae)- A shoot borer on cashew in Kerala
(Kerala Agricultural University, Vellanikara, 1964) Remamony, K S
Biology of folyorycta (Eublemma) dimidialis F. A pod borer of pulses
(Kerala Agricultural University, Vellanikara, 1968) Remamony, K S; Nair, M R G K
Integrated control of fruit fly Dacus cucurbitae Coq: Trypetidae: Diptera on bitter gourd
(Department of Entomology, College of Agriculture, Vellayani, 1989) Jalaja, P N; Remamony, K S
Bittergourd is very popular among the vegetable growers in Kerala. Fruit flies take a heavy toll of this crop and intense use of pesticides is a common practice of cultivators often leading to serious residue hazards in the marketed fruits. In the present investigation an attempt was made to standardise non-insecticidal methods of control for tackling this pest problem. Laboratory evaluation of potential attractants of fruit flies viz. eugenol, eucalyptus oil, citronella oil, borar, ammonium phosphate, vanilla essence, jaggery, sugar, vinegar, honey, toddy and bittergourd fruits were screened for baiting the adults of D. cucurbitae. Eugenol, eucalyptus oil, citronella oil, borax, ammonium phosphate and vanilla essence did not show any attractiveness to the flies. Three graded concentrationsof honey, sugar, jaggery, toddy and vinegar were tested for their attractiveness to the files in the laboratory. The result showed that (1) honey at the highest concentration of 1% attracted the maximum number of flies (2) toddy was not effective for attracting D. cucurbitae. (3) immature stages of bittergourd fruits showed poor aatraction and (4) ripe bittergourd fruits showed poor attraction and (4) ripe bittergourd fruits showed maximum attraction to the files up to 12 h of exposure.
Occurrence of Ichthyura Restitura Walker (Notodontidae: Lepidoptera) as a serious pest of lovi-lovi, Flacourtia inermis Roxb
(Kerala Agricultural University, 1978) Abraham, C C; Remamony, K S
On control of the melon fly Dacus cucurbitae Coquillett with some newer synthetic insecticides applied as cover sprays
(Kerala Agricultural University, Vellanikara, 1968) Das, N M; Remamony, K S; Nair, M R G K