Articles
NATURAL CONTENT OF PHENOLS AND TANNIN IN QUERCUS ROBUR LEAVES RELATED TO DEVELOPMENT OF EUPROCTIS CHRYSORRHOEA CATERPILLARS
L.
Total phenols are mostly significantly higher in leaves of resistant compared to unresistant trees and directly inhibit caterpillar development.
Tannin is also higher in resistant trees and is sometimes higher in mature leaves but influence caterpillar development as a phenolic compound.
In ingraft seedlings the content of phenols and tannin has equal or even higher mean values compared to the parental resistant tree.
Total phenols are positively related to tannin, organic acids, protidic nitrogen, fructose and saccharose in leaves, as well as to pH, kalium (potassium), calcium and magnesium from the soil under the trees.
Tannin, as a special group of phenols, is positively related to total phenols and organic acids in leaves, as well as to nitrogen and phosphorus in soil and negatively to pH, kalium, calcium and magnesium from soil.