تأثير بعض الصفات المورفولوجية و الكيميائية في الذرة الصفراء Zea mays لمقاومة حفار ساق الذرة Sesamia cretica

الملخص EN

Six Com genotypes (Bohoth 106, CBR.

2000, IPA 2052, IPA 5012, SAKHA 9433 and CML 329) were considered to conduct this research.

The study showed differences between genotypes irt characters (plant length, number of leaves and leaves area).

The correlation among these characters and percent of infection by Com Stem Borer (CSB) didn’t appear to be significant.

Results of the field survey showed negative correlation between the Trie homes density and the predator numbers Coccinella undecimpunctafa, it was found the predators numbers 39 and 11 per 100 plant in com genotypes low and high density Trichomes respectively.

The study was also included analysis of primary and secondary metabolites present in the green parts of all com genotypes under the study; these compounds were carbohydrates, protein, fats, fibers, lignin and coummanns.

Results of analysis indicated differences in the percentage of these compounds between genotypes.

Although, there were differences in the percentage of the primary compounds, they didn’t have any influence on the infection by CSB.

Meanwhile, lignin content in green parts of com genotypes were ranged from 11,9 to 18.]% Such finding was related to the leve! of infection by CSB, It was found that infection decreased as lignin percent increases, for the coummarins, the results showed that these compounds were present in different amounts in com genotypes.

It was found the survival percent of larvae decreased as eouinmarinu percent increases, Although percent damage decreased as coummarins amount increases in genotypes.