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Aspects of histology and histochemistry of injured tissues of Lycopersicon esculentum Mill due to feeding by the mirid, Cyrtopeltis tenuis Reut, based on increased activities of proteins, tannins, peroxidases, polyphenol oxidases and acid phosphatases are discussed.

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Biochemical analysis of host plants of 6 species of acridids for their total protein, carbohydrates, phenols, free aminoacids, water and nitrogen content revealed significant correlation in regard to their host preferences, wherein the leaf water-nitrogen index as well as the total phenol composition appeared to play an important role.