Beniwal, R.S.Rajat Swami2024-05-142024-05-142022-12https://krishikosh.egranth.ac.in/handle/1/5810208950The present investigation entitled “Variation among Populus deltoides Bartr. ex Marsh clonal plantations for growth and development for attack of insect-pests and diseases” was carried out at two sites, namely CCS Haryana Agricultural University, Hisar and Chhachhrauli block of Yamunanagar from June, 2021 to June, 2022. The growth and development of poplar for the observed period regarding height was seen maximum in WSL-110 (6.30 m) and GBH in WSL-83 (16.33 cm). The maximum susceptibility and incidence of leaf defoliator was seen in the clone WSL-83 with 40.97% leaf damage and 7.51 larvae/plant in 2nd fortnight of October at both the sites. The maximum incidence of stem borer was seen in the 1st fortnight of March in WSL-111 (3.08 holes/stem), whereas the maximum infection of leaf spot (60.94%) was seen in the clone WSL-110 during the 2nd fortnight of October at both the sites. The growth and development were maximum in clone WSL-110 and WSL-83, but for the incidence and susceptibility of the poplar to leaf defoliator, stem borer and leaf spot; the criteria identified viz. current annual increments in height and girth coupled with the occurrence of larvae/plant, holes/stem and leaf infection are the valuable parameters which may be given due importance for raising poplar successfully for plywood purposes.EnglishThesis