Sandhu, Sarabjot KaurKarmjit Singh2018-05-272018-05-272018http://krishikosh.egranth.ac.in/handle/1/5810047775The present study entitled “Crop-weather insect/disease interactions in mungbean under different growing environments” was conducted during kharif season 2016 at Research Farm, School of Climate Change and Agricultural Meteorology, PAU Ludhiana. The experiment was laid with split-split plot design with three different growing environments viz. three dates of sowing in main plots (1st July, 15th July and 30th July), two varieties in sub plots (ML 2056 and PAU 911) and three different row spacings in sub sub plots (22.5 cm, 30 cm and 45 cm) having 6 replications out of which 3 were sprayed and 3 were unsprayed. The micrometeorological parameters viz. photosynthetically active radiation (PAR) and relative humidity (RH) were recorded at periodic intervals while daily meteorological parameters were recorded in the Agrometeorological Observatory. Biometric observations such as leaf area index (LAI) and dry matter accumulation were recorded periodically. The yield and yield contributing characteristics were recorded at harvesting. The insect count i.e. number of whitefly per plant, MYMV incidence and severity were recorded at weekly intervals. Based on the visual observations the disease incidence was calculated and further the disease severity was also worked out to classify the two mungbean varieties as resistant or susceptible. The results revealed that whitefly population and disease incidence percentage was more in 1st July (2.1-10.5 whitefly per plant and 76%) sowing in variety PAU 911 (2.6-11.4 whitefly per plant and 79%) with narrow row spacing of 22.5 cm (2.4-9.3 whitefly per plant and 75%) respectively than the other treatments. The whitefly population was significantly correlated with minimum temperature and morning relative humidity while the disease incidence and severity were significantly correlated with minimum temperature, morning and evening relative humidity. The relationships between PAR interception, leaf area and dry matter accumulation signified the percent variability in PAR interception due to change in leaf area index and dry matter accumulation in mungbean. The accumulated growing degree days (AGDD), accumulated heliothermal units (AHTU) and accumulated photothermal units (APTU) were significantly higher in case of early sown crop i.e. 1st July in variety ML 2056 than other treatments. The yield losses from different treatments were reported to be higher in late sown crop 30th July (24.37 %) in variety PAU 911 (37.68 %) with row spacing of 22.5 cm (23.44 %).ennullThesis