Role of morpho-physical plant factors imparting resistance in cotton against thrips, thrips tabaci lind (Thripidae : Thysanoptera)‎

الملخص EN

Studies were conducted to find the role of some morpho-physical plant characters of various cotton genotypes viz., BH-118, CIM-443, CIM-448, FH-634, FH-87, HR-129, VH-142, SLS-1, HRVO and Okra-170 in developing resistance against thrips, Thrips tabact (Lind.).

All cotton genotypes significantly differed in their responses toward thrips as well as in all the morphological plant traits.

The results revealed that CIM-448 was comparatively susceptible to thrips, while HRVO was resistant.

Environmental conditions during the last week of July, August and September were favorable and peak thrips population was observed, and all cotton genotypes significantly differed in relation to all the morphological plant traits.

Hair density on midribs and veins of upper leaves showed significant and negative correlation with thrips population.

The length of hair on midrib of upper leaves, midrib and lamina of middle leaves and midrib, veins and lamina of bottom leaves played a negative and significant role in relation to thrips population.

Number of ‘Gossypol glands on midrib, veins and lamina of upper middle and bottom leaves were correlated significantly and showed negative response to thrips population.

All other morpho-physical traits expressed nonsignificant correlation in relation to resistance against thrips population.