M B Kalode
Articles written in Proceedings – Animal Sciences
Volume 91 Issue 2 March 1982 pp 165-176
Three species of egg parasites, viz.,
Developmental duration from oviposit ion to adult emergence noted for these parasites indicated that males of mymarids, in general, developed faster (10–11 days) than females (12–13 days) at 20–32° C prevailing during October, whereas
Volume 93 Issue 1 January 1984 pp 55-63
Employing three different methods, 108 rice varieties were screened for resistance against
Volume 94 Issue 1 January 1985 pp 37-48
A total of 1070 rice varieties, mainly from Assam Rice Collection, were evaluated to identify better sources of resistance to brown planthopper,
All the resistant and moderately resistant varieties were relatively less preferred by nymphs and there was a positive correlation between the number of nymphs settled and the damage score. Test varieties non-preferred by adult insects for feeding and shelter were also less suitable for oviposition with the exception of ARC 13854, and ARC 14766A. On resistant varieties the nymphal survival was much lower (18·5–28·4%) and nymphal duration was prolonged by 5–7 days as against those on the susceptible check. Results of probing behaviour tests indicated that resistant varieties received more number of probing punctures (80–121) than the susceptible check (31). Further, insects caged on resistant varieties quickly lost their body weight while those on the susceptible check registered gain in weight. Honey dew excretion by brown planthopper adults on resistant varieties was 6·6 to 11·9 times less than that on susceptible T(N)1. Selected varieties showing moderate damage reaction (ARC 5918, ARC 10443, ARC 13984, ARC 14529 and ARC 14864) exhibited more feeding marks, greater amounts of excretion, and higher gain in body weight of the insects, thus confirming a moderate degree of resistance. Based on various parameters, ARC 5780, ARC 5988 and ARC 14394 were comparable to resistant check, Ptb 33 in level of resistance. No association of Lemma and Palea colour with brown planthopper resistance was observed in the rice varieties tested.
Volume 95 Issue 2 April 1986 pp 227-236
Intensive host range studies comprising of 55 common weeds and eight cultivated plant species indicated that
Volume 96 Issue 4 July 1987 pp 425-435
In multiple-choice tests with 30-day-old plants of resistant and susceptible varieties, both the species of green leafhoppers,
Field investigations indicated that resistant varieties viz Ptb 18, Ptb 2 and Ptb 7 harboured less population of green leafhoppers and had relatively nil or very low incidence of tungro virus disease. An year round survey in the rice ecosystem and marshy habitat where
Volume 99 Issue 1 January 1990 pp 57-66
Biochemical analysis of 4 rice varieties and a weed showed that the total free amino acid content was greater in the susceptible variety TN 1 than in Ptb 2, Ptb 7 and Ptb 18 which are resistant to both the species of green leafhoppers. However, the weed Leersia hexandra the most suitable host of
Bioassay of plant extracts in various organic solvents showed that the chloroform and acetone extracts of the resistant variety Ptb 18 were phagodeterrents to either species of green leafhoppers, while the extract of the susceptible variety with the same solvent was phagostimulant. Of the various chemicals bioassayed, sucrose (5%) among the sugars tested, was found to be highly stimulatory for feeding. Among amino acids, serine, alanine and glutamine were feeding stimulatory in nature. On the other hand, most of the amino acid derivatives, all organic acids and phenolic compounds tested exhibited phagodeterrency.
Volume 99 Issue 6 November 1990 pp 483-491
Dynamics of leaf feeding by the larvae of rice leaf folder
The proposed feeding test involved caging of individual V instar larvae for 48 h on 30–45 days old plants of test varieties and recording area of leaf damage. The test revealed varietal differences in area of leaf damaged by the leaf folder and displayed consistency over time. Based on feeding test, 19 rice varieties have been identified as resistant against leaf folder.