Reproductive Behavior and Population Ecology of Philus antennatus

by Chiu, Chien-chih

Abstract (Summary)
Wendan Citrus grandis was introduced from FuJian province to Taiwan in 1701 (Kanghsi 40 years, Ching dynasty), and wide planted around Madou county, Tainan since. In recent years, it was found that Wendan was easily infected and damaged by long-horn beetle Philus antennatus, which caused damage even worse than another destructive insect, white-spotted Long-horned beetle Anoplophoa malasiaca. From May 2003 to May 2009, I investigated the reproduction, development and population dynamics of the beetle in a shaddock orchard in Madou, and conducted experiments on its behavior. The results showed that wrinkled triple like T character in the front chest and pronotum is one of the characteristics of Philus antennatus larva. The adults were nocturnal and often came out of the excavation in the night to copulate. After copulation, female would lay eggs in a small crack. After hatched, the larvae drilled into soil and dwelled in the host plant, eating wendan¡¦s fibrous roots, the phloem of the major roots, etc. Tender fibrous roots of shaddock¡¦s trunk were severely damaged by the larvae, resulting in host plants not able to transport water and nutrients to the leaves, which would dry out and drop. Consequently, the host plants would gradually die. The life cycle of Philus antennatus lasted about one to two years. Four stages, egg, larva, pupa and adult were observed to complete metamorphosis. The adult¡¦s life is short. After eclosion, the adults hide in the soil and do not eat. They will come out of the excavation only for copulation, and then died about 5 days after copulation. Eclosion stage lasts about 30 days, starting in late May, and incubation of egg takes about 13 -18 days. The larva stage lasts 1-2 years. But with bad climate or unfavorable environment, ecdysis would extend, and larvae would not eclosion
Bibliographical Information:

Advisor:Michael Hin-Kiu Mok; Hsueh-Wen Chang; Chien-Chung Cheng

School:National Sun Yat-Sen University

School Location:China - Taiwan

Source Type:Master's Thesis

Keywords:population ecology reproductive behavior philus antennatus


Date of Publication:09/01/2006

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