Biological activities of developmental stages of citrus tree borer Chrysobothris dorsata (Buprestidae : Coleoptera)‎ on casuarina trees

الملخص EN

Chrysobothris dorsata (Fabricius) (Buprestidae:Coleoptera), female beetle put its eggs singly under the bark through crevices and cracks with trunks and branches of trees.

The eggs are pale orange to pale brown in colour, semi-cercular in shape, about 1.14x 1.095 mm.

The incubation period lasted 5- 12 days with an average 8.5+ 2.1days.

The larva of C.

dorsata has six larval instars.

The duration of immature larva ranged 280- 349 days (average, 313.8 + 20.1 days), while duration of full-grown larvae ranged 9-22 days (average, 15.2 + 4.5 days).

The prepupal duration lasted 7-15 days (average, 10.3 + 2.5days).

The duration of pupa ranged 9-18 days (average, 12.8 + 2.8 days).

The duration of adult stage inside the pupal chamber recorded 6-11 days (average, 8.2 + 1.4 days).

the beetles lived after emergence from host about 5-13 days (average, 7.9 + 2.1 days).

The averages of preoviposition, oviposition and postoviposition recorded 2.1+ 0.8 days (ranged, 1-4 days), 3.8 + 1.1 days (range 2 – 6 days) and 2.6 + 0.8days (range 1-4 days), respectively.

The life cycle of C.

dorsata beetle rearing in casuarina trees recorded 369.6 + 18.9 days (ranged 346 – 405 days).