Fruit Stalk Borer, Oryectes elegans Prell (Coleoptera: Scarabaeidae)
The fruit stalk borer is found in the Arabian Peninsula as well as in Iraq and Iran. The adult is a stoutly built rhinoceros beetle that is shiny and reddish brown in color. The body length is about 34–36 mm in the female and 28–34 mm in the male. Adults have a horn-like structure on the head which is longer in females. The dorsum of the first thoracic segment has a depression that is deep and large in the female and shallow and small in the male. Mature larvae are about 55–65 mm in length, creamy white in color with brown heads, curved in shape and the last three abdominal segments are thicker than the remaining segments. Two cellulose destroying fungi, Chaetomium elatum and C. murorum, are found in the frass of fruit stalk borer larvae. The adults hide during the day in damp, organic soils. The adults are attracted to light from April to September and do great damage by boring through the leaf-bases and stems of inflorescences in the crown of the tree.
Importance and Damage
- Talhouk N (1984) The most common agricultural pests in Saudi Arabia. Ministry of Agriculture and Water, 121 pp (in Arabic)Google Scholar
- Hussain A (1974) Pests of date palm trees and dates in Iraq. Bagdad University, 190 pp (in Arabic)Google Scholar
- Hammad SM, Kadous AA (1989) Studies on the biology and ecology of date palm pests in the eastern Province of Saudi Arabia. Research Grants Program, Technical Report No 25. KACST, Riyadh, Saudi Arabia, 142 ppGoogle Scholar