Menace of die-back in shisham plantations of District Jhang
Abstract
Shisham (Dalbergia sissoo Roxb.) die-back on state owned forests and farmlands in district Jhang was studied during 2003. An area of 120 acres of Shorkot plantation, 50 acres of Sajhowl bela , 11 avenue Km of Jhang - Sargodha road side, 18 avenue Km of Rangpur canal side and 16 different land holdings of 4 rural union councils of tehsil Jhang were randomly selected. The results indicated that maximum tree mortality of 34% was observed along roadside followed by 25% on canal side, 23.12% in irrigated plantation and 20 % in Bela (Riverian) forest. The age classes of these forest categories varied from 7-11 (Farmlands), 5-25 (riverian forest), 20-35 (road sides ), 30-35(irrigated plantations) and 35-60(canal sides) years. None of these forest categories was water logged and saline except Shorkot plantation. The results of 16 different landholdings encompassing an area of 496 acres with an average of 13 trees per acre varying in age from 3-35 years depicted a significant increase in infection with the age of trees. Although the average infection percentage/ landholding was low (16.16%) but a maximum of 40.0% with a varying number of completely dead trees were recorded.
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