Abstract
Sixteen varieties / advanced lines of cotton were tested at Faisalabad for their relative resistance against insect pests complex of cotton with reference to physico-ehemical factors, like number of hairs on leaf uein and leaf lemina, length of hair, number of gossypol glands on various plant parts, total minerals, Ca, Fe, K, Mg, protein, fats and reducing sugars in . the leaf tissue. Out of these varieties, AU-14 proved comparatively resistant to cotton Jassid whereas NL-ll~2-1, Stone Ville 731-N and CIM-10 were very susceptable to it. The varieties did not reveal any significant difference among themselves with regard to whitefly and thrips populations. The minimum number of cotton aphids / leaf was recorded on Stone Ville 731-N whereas it was maximum on MNS-79. Maximum attack of pink bollworm was on MNS-79 and was minimum on NL-11-62-1, MNH-49, CIM-10 and A-89/ FM. Maximum number of hibernating larvae were found in the seeds of NL-1l-62-1, whereas it was minimum in MNH93. The spotted bollworm attack was minium on MNH-93 and maximum on CIM-10. AU-14 gave the highest yield. Jassid was observed to be the key pest having negatiue correlation with yield.

Rana M.Yousaf , Manzoor Ahmad. (1990) RELATIVE RESISTANCE OF SOME COTTON CULTIVARS AGAINST INSECT PESTS WITH REFERENCE TO PHYSICO-CHEMICAL CHARACTERS, , Volume 27, Issue 4.
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