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Helicoverpa armigera in India attacks more than 182 plant species (Gowda, 2005) and is found all the year around, being more abundant during August to January, particularly in the southern parts of the country on crops like cotton, groundnut, beans, pigeon pea, chickpea, etc. On tomato, the pest is reported to cause considerable fruit damage and yield losses depending upon agro climatic conditions. H. armigera feeds on both tomato foliage as well as fruit by feeding inside it, thus affecting fruit quality. The damage by H. armigera starts soon after fruiting period of the crop; and the newly hatched larvae bore into the fruit and feed inside. In India, three species, namely H. armigera, H. peltigera (Schiff.) and H. assulta (Guenee) occur on tomato, but H. armigera is by far the most important and devastating (Jayaraj, 1982). H. armigera larvae are extremely damaging because they prefer to feed and develop on the reproductive structures of crops which are rich in nitrogen (Fitt, 1989) and these structures are often part of the crop that is harvested (King, 1994). Insect abundance and distribution are Studies were carried out at Experimental Farm, Faculty of Agriculture, Wadura, Sopore, SKUAST-K, during the year, 2016-2017. The larval infestation of H. armigera started a month and half (22SW) after transplanting of the crop in all the tomato genotypes. A negative and nonsignificant correlation was computed between H. armigera larval population and maximum temperature (r = -0.032), whereas sunshine hours had negative and significant association (r = -0.566) with fruit borer larvae. The other abiotic factors such as minimum temperature, rainfall, maximum and minimum humidity had significant and positive correlation with r values of 0.874, 0.734, 0.543 and 0.593, respectively. K e y w o r d s

Effect of Abiotic Factors on Larval Population Build Up of Tomato Fruit Borer, Helicoverpa armigera Infesting Different Tomato Germplasm