Eight sesame (Sesamum indicum L.) genotypes were crossed in a half diallel mating fashion. The analysis of variance for combining ability revealed that the mean sum of squares are due to the general combining ability were highly significant for all the traits. The t 2 test specified the fulfillment of assumptions required under diallel analysis for all the traits studied except the number of effective branches per plant, capsule length (cm) and harvest index (%). The component D measures the additive effects of genes. It was significant for all the traits except seed yield per plant and harvest index. The components H 1 and H 2 were significant for all the traits except days to maturity revealing the importance of fixable and non-fixable component. Greater values of H 1 than H 2 and the ratio of H 2 /4H 1 (< 0.25) confirmed the unbalanced distribution of gene at the loci in the parents' implying dominance for all the traits. It was also confirmed by greater than one value of KD/KR components for all the traits which suggested the higher frequency of dominant genes than recessive genes in the parents. The component F was significant for days to flowering, days to maturity, capsule length, oil content and leaf area per plant. The graphical analysis showed the regression line intercepted Wr axis below the origin indicating over dominance for plant height, the number of seed per capsule, oil content and leaf area per plant. The regression line intercepted the positive side of Wr axis for days to maturity which implies the presence of partial dominance.

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The efficacy of some combination fungicides like fenamidone 10% + mancozeb 50% WDG, metiram 55% + pyraclostrobin 5% WG and cymoxanil 8% + mancozeb 64% WP along with commonly used fungicides viz., dimethomorph 50% WP, fosetyl Al 80% WP, mancozeb 75 WP, metalaxyl 8% + mancozeb 64% WP, captan 70% + hexaconazole% WP and carbendazim 25% + mancozeb 50% WS were tested against early blight of potato cv. kufri pukhraj at Agricultural Research Station, Ladol and Potato Research Station, Deesa, S. D. Agril. University, Gujarat during 2015-16 to 2017-18. A variant with no application of fungicide was used as a control. All the treatments reduced the disease intensity significantly as compared to untreated check. The data on PDI of early blight of potato was recorded periodically at 50, 60 and 70 days after sowing with consecutive three spray of fungicides at 15 days interval and was found low to moderate in range (10.07-37.98 %). The lowest per cent disease intensity (PDI) 10.07 was observed in case of fenamidone 10% + mancozeb 50% WDG @ 0.2% treatment (2.5 gm/l) followed T 8 spraying of metiram 55% + pyraclostrobin 5% WG @ 0.2% (2 gm/l) and T 2 spraying of cymoxanil 8% + mancozeb 64% WP @ 0.25% (2.5 gm/l) with its PDI at par values. It significantly reduced the early blight as compared to control. Similarly, the highest yield of potato tubers was also recorded in T 1 spraying of fenamidone 10% + mancozeb 50% WDG @ 0.2% (2.5 gm/litre) against early blight with 51661 kg/ha followed by metiram 55% + pyraclostrobin 5% WG @ 0.2% (2.0 gm/litre) and cymoxanil 8% + mancozeb 64% WP @ 0.2% (2.5 gm/litre) with its yield 49309 and 48984 kg/ha, respectively. Thus, it can be said that combination of systemic and contact fungicides effectively suppressed pre-as well as post-infection activity and inhibited sporulation and/or restricted lesion expansion of early blight pathogen. Also found increase in the yield of potato as well.

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