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Yield potential of lablab bean is adversely affected by the most significant disease namely Bean common mosaic virus (BCMV). Fifteen genotypes of lablab bean (Lablab purpureus L.) were used for genetic analysis and detection of bc-3 gene conferring resistance to bean common mosaic virus. Thirteen yield contributing traits were evaluated for enumerating genetic variability and trait association. Phenotypic variations were greater than the genotypic variations indicating the existence of environmental effect on trait expression. Five pairs of characters showed significant correlation and path analysis revealed both direct positive and negative effects of the yield contributing traits on seed yield. For detection of bc-3 resistance gene, two SCAR primers ROC11 and SG6 were used. Nine genotypes were produced expected bands for SG6 primer indicating the partial resistance due to presence of recessive bc-3 allele. These results could be helpful for further crop improvement program of lablab bean. [ABSTRACT FROM AUTHOR]

The present investigation was carried out to study the effect of insecticidal spray on population of natural enemies in lablab bean ecosystem during Rabi season of 2017-18 and 2018-19 at Botany farm, College of Agriculture, Dapoli. The results indicated that the mean population of coccinellids during both the years was highest (13.37) coccinellids population plant-1 recorded in treatment T9 (Control water spray) which was significantly superior over rest of the treatments. The mean population of mirid bugs during both the years was revealed that the highest (11.33) mirid bug population plant-1 recorded in treatment T9 (Control water spray), which was significantly superior over the rest of the treatments and at par with treatment T2 (Azadirachtin 10,000 ppm) recorded 9.87 mirid bugs plant-1. The mean population of spiders and syrphids during both the years was revealed that the highest (18.97) spider population plant-1 and (12.33) syrphids plant-1 recorded in treatment T9 (Control water spray), which was significantly superior over rest of the treatments. [ABSTRACT FROM AUTHOR]

Abstract: This study was conducted to determine silage fiber characteristics and fermentation profiles of corn (Zea mays L.) grown in mixture with lablab bean [Lablab purpureus (L.) Sweet] at different planting densities. The experiment was conducted in two environments in 2005. ‘Rongai’ lablab bean and corn were intercropped at eight different planting densities; 20/80, 40/0, 40/40, 40/80, 60/0, 60/40, 60/80, and 80/80 thousand corn/lablab bean plants/ha. Corn in monoculture or in mixture with bean was harvested between 1/2 and 3/4 milk line. Two 1-L glass jar mini-silos per treatment per replicate plot were filled at a density of 500g/L, eight jars per treatment per location, and stored for 40 days at room temperature (∼22°C). At the time of ensiling a 500-g fresh sub-sample was also taken for dry matter (DM) and initial characterization of the corn and corn–bean mixtures. Each silo was analyzed for fiber characteristics, pH, and fermentation products. Silage crude protein (CP) concentration was on average 17.5% (86.4g/kg DM) greater in the mixture than monoculture corn (73.5g/kg DM). The in vitro true digestible DM (IVTDDM) concentrations in the mixtures were on average 4.6% less (796g/kg DM) than that of monoculture corn (834g/kg DM), but neutral detergent fiber digestibility was not different between monoculture corn and corn–lablab mixtures (P>0.05). Lactate concentration was 21.2% higher in the corn–lablab bean mixtures (60.5g/kg DM) than monoculture corn (49.9g/kg DM). The contribution of the lablab bean to the mixture increased as corn planting density decreased. Thus the maximum benefits to increased CP occurred in the mixtures with the lowest corn planting densities, but those mixtures also had the greatest reductions in IVTDDM. However all treatments fermented well in spite of significant (P<0.05) differences in pH and fermentation products. [Copyright &y& Elsevier]