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The objectives of this study were to identify and categorize sources of resistance in kachri genotypes to Bactrocera cucurbitae (Coquillett) from the arid region of India. The genotype IC-350933 and IC-370479 were found to be highly resistant; IC-351005, IC-351088, IC-258153 and DKS 2011/01 were found resistant; IC-350895, IC-350924, IC-350958, IC-350964, IC-350970, IC-351073, IC-351142, IC-351202, IC-258140 and IC-373479 were moderately resistant; IC-350903, IC-350919, IC-350941, IC-351012, IC-351030 and IC-258137 were susceptible; IC-351258 and DKS 2011/12 were found the highly susceptible genotype to melon fruit fly infestation. The phenols (r=-0.90), tannin (r=-0.89), total alkaloids (r=-0.80) and flavonoid (r=-0.96) contents had significant negative correlation with percent fruit infestation. The percent fruit infestation had significant negative correlation with length of ovary pubescence (r=-0.95), rind hardness (r=-0.94) and rind thickness (r=-0.91). Flavinoid and tannin contents explained (91.2 and 92.1 % respectively) of the total variation in fruit fly infestation and in larval density per fruit. Maximum variation in fruit infestation and larval density was explained by the length of ovary pubescence (89.5 and 84.8% respectively) followed by rind hardness (4.3 and 3.3% respectively). Based on Kaiser Normalization method, two principal components (PCs) were extracted explaining the cumulative variation of 88.19% in melon fruit fly infestation. PC1 explained 71.56 % of the variation while PC2 explained 16.62 % of the variation. Kachri genotypic variability can improve plant fitness via bottom–up effects on fruit fly infestation. Growers can adopt potential genotypes of kachri as identified for resistance (IC-350933 & IC-370479) with minimal financial investment for obtaining higher yield. Hence, a benefit of diversity for yield potential is recognized and thus genotypes diversity is used to become a prominent answer for sustainable management tactic. |
