Growth response of Lymantria obfuscata Walker in relation to tannin content in different host foliages.
The effect of the tannin contents of 15 different food plants on the growth of Lymantria obfuscata was studied in the laboratory. Tannin contents were found to increase with maturation of leaves and were higher in pear (Sand and William) than in the other plants, and larvae did not survive on the foliage of these. Apricot, walnut, cherry and almond had relatively high tannin contents, and larval development on these was slower with lower pupal weights than on 3 apple varieties (Red Delicious, American Apirouge and Ambri), Salix alba and Populus nigra, which had low tannin contents (0.33-0.83% of dry weight). The results showed a direct relationship between the tannin content of plants and development and survival of L. obfuscata.