• D Raychaudhuri

      Articles written in Proceedings – Animal Sciences

    • Behavioural response (feeding preference and dispersal posture) ofAphis gossypii Glover on brinjal crop

      T K Banerjee D Raychaudhuri

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      During late July to early August (kharif) and late November to late December (rabi), alates ofAphis gossypii Glover appear on the old leaves of the tender brinjal plants. Population build up is quite gradual with a sigmoid growth and the pest reaches peaks during late December (kharif) and late February (rabi) when plants become mature. In course of incidence they distribute from old to young to tender leaves and the aphid incidence on these leaves is always followed by the migration of alate immigrants. Thereafter, the aphid prefers mature tissues of the crop and in course of crop maturity its dispersing trend follows from old to the other leaves as well as plants in a sigmoid posture in a latero-angular spectrum.

    • Correlation of nutritional changes with the reproductive potential ofAphis gossypii glover on egg plant

      T K Banerjee D Raychaudhuri

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      Brinjal (solanum melongena Linn.) leaves of varied maturity show a remarkable variation in respect to the retention of nutrient contents therein. The contents also vary along with the increase of plant age.Aphis gossypii Glover, an important pest of the crop, shows high reproductive potential on old and young leaves when the plants are young (2–4 months old) and mature (4–6 months old) respectively. Amongst the nutrient content of the leaves, nitrogen level shows a significant correlation with the reproductive potential of the aphid species leading to its population outbreak and niche selection.

    • Importance of Karyology in aphid taxonomy

      D Raychaudhuri P L Das

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      Cytological parameters are nowadays being increasingly and intelligently used in solving the taxonomic problems of dubious species. Aphids’, in certain cases atleast, taxonomy is not stabilised at the species as well as at the subgeneric level. It is because of the usual occurrence of race or biotype in natural population. Occurrence of such taxonomic categories are possibly due to chromosomal rearrangements or otherwise that resulted from the association with a host plant, as evidenced in a few species, viz,Myzus persicae, Brachycaudus helichrysi, Tuberolachnus salignus etc. Several ecogeophysical factors are operative in establishing chromosomally distinguished races which demand the attention of taxonomists for further taxonomic evaluation of the concerned species. Attempt is therefore made to discuss the rationale of using the cytological informations in the identification of infraspecific categories of aphids.

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