Chemical factors affecting resistance in cotton with respect to the position of leaf against jassid, Amrasca devastans (Dist.) and thrips, Thrips tabaci (Lind.)
1995
Ali, A. (Ayub Agricultural Research Inst., Faisalabad (Pakistan). Entomology Section) | Bhatti, M.A. (Nuclear Institute for Agriculture and Biology, Faisalabad (Pakistan)) | Khan, A.S.
Four varieties of cotton (CIM70, FH87, NIAB86 and MNH93) and six advanced lines (P-2/2, P-43/13, P-43/51-2, P43/60, S-9/1 and S-20) were tested for resistance against jassid, Amrasca devastans (Dist.) and thrips, Thrips tabaci (Lind.) with respect to leaf position during 1992 under Faisalabad ecological conditions. The entries differed significantly in jassid and thrips population except population of jassid on top leaves and in all the chemical factors on top and middle + bottom leaves. Higher quantity of nitrogen, protein, calcium in top leaves, total lipids, reducing sugars, calcium and zinc in middle + bottom leaves and lower amount of total minerals, copper and zinc in top leaves contributed resistance against thrips. Total lipids, reducing sugars, magnesium and calcium in middle + bottom leaves showed negative and significant correlation with jassid population while total minerals played positive and significant role for the same insect.
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