2001 Volume 70 Issue 6 Pages 753-759
Significant differences in numbers of resident leaf beetles (Aulacophora nigripennis) were observed among 28 Dianthus plant species. D. pungens showed significantly high frequencies of beetles than on carnations (D. caryophyllus). This indicated that D. pungens might serve as a trap plant for A. nigripennis. To prove that trap plants can control A. nigripennis, four D. pungens seedlings were planted in a container. A container was placed outside both entrances of one greenhouse (3.3×4.0m) where 120 carnation plants were growing. No trap plants were set up at the entrances of the second greenhouse where the same number of carnation plants were growing. When the trap plants were used, the mean number of resident A. nigripennis per 100 carnation plants per day from Aug. 22 to Oct. 2, 1999, decreased from 1.5 to 0.1. The rate of damaged carnations decreased from 55.8% to 4.2%, and the damage index decreased from 20.8 to 1.0. The results showed that D. pungens is useful as a trap plant to control A. nigripennis during carnation production.