Abstract
The present study was performed to evaluate the performance of Bt and Non-Bt cotton cultivars in response to population fluctuation of thrips in field under RCBD. On the numerical basis results revealed that transgenic cultivars were more susceptible to thrips infestation as compared to conventional genotypes. The pooled comparison of thrips/leaf on different tested cotton cultivars revealed highly significant variations. The results showed that the highest population was observed on IR-901 and FH-113 (3.11 and 3.14 thrips/leaf, respectively) followed by N-121 (2.79 thrips/leaf) and FH-154 (2.78 thrips/leaf). While low level of infestation was observed on CIM-496 and FH-941 (2.20 and 2.18 thrips/leaf, respectively) followed by FH-1000 (2.29 thrips/leaf), FH-207 (2.31 thrips/leaf) and FH-4243 (2.40 thrips/leaf). When data were statistically analyzed thrips population on Bt and non Bt cultivars revealed that Bt cotton cultivars had higher level of thrips population (3.8 thrips/leaf) compared to non Bt cultivars (2.7 thrips/leaf).
Highlights
Cotton (Gossypium hirsutum L.) is an important cash crop of a number of countries, grown on an area of more than 38 million hectares [1]
Maximum level of thrips population per leaf was perceived on N 121 (4.10), IR 901 (3.83), FH 154 (3.78) and FH (3.72), all were statistically similar, followed by FH (3.45). while least population was recorded on FH 4243 and FH 207 (2.49, 2.50 thrips/leaf, respectively), both were statistically at par (Figure 1)
Pooled comparison of transgenic vs conventional cotton cultivars in relation to population fluctuation of thrips showed that transgenic crops had higher level of thrips infestation (3.58 per leaf) compared to non Bt cotton cultivars (1.87 per leaf) (Figure 2)
Summary
Cotton (Gossypium hirsutum L.) is an important cash crop of a number of countries, grown on an area of more than 38 million hectares [1]. Cotton varieties are grown in numerous countries of over five continents [2]. It is an employment generated industry and estimated that about 250 million people are dependent on production, processing and marketing of cotton all over the world. Developing countries provide 50 percent of raw cotton to the developed nations for further processing. Cotton is an important cash crop of Asian countries [3]. Cotton; being a major cash crop provides 38% of industrial employment, and runs the 31% of investment sector [6]. In old days cotton was sown in lines but a days almost 50% of cotton growers are adopting new technologies during sowing, growing, protecting and harvesting [7]
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