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Bionomics of Eublemma Amabilis Moore (lepidoptera: Noctuidae), a Major Predator of Lac Insect and Its Control Measure

M. Matiur Rahman
BCSIR Laborstories, Rajshahi-6206

K.N. Ahmed
BCSIR Laborstories Dhaka

K. N. Shahjahan Karim
Govt. City College, Rajshahi

M Sohrab Ali
Dept. of Zoology, Rajshahi University, Rajshahi, Bangladesh

Abstract/ Executive Summary:

The moth, Eublemma amabilis Moore is very destructive to lac insect and lac encrustation. The moth is generally white-pinkish in colour and it lays gray-white and round eggs, depressed in the centre. The newly hatched larva enters the lac insect either through one of the opening in the cell or by tunneling a hole through the encrustation. A single larva damages 42-50 matured cells prior to pupation. It completes six generation in a year and causes comparatively more injury to the “Kartki” crop than to the Baishaki crop. The morphological details of this predator were studied. Several natural enemies of E. amabilis have been recorded.

Keywords: Eublemma amabilis, Lac, Predator, Crop injury and Control measure.

Location: Both in the laboratory and in the field of BCSIR Laboratories, Rajshahi

Start Date:

End Date:

Program Area: Pest Management

Commodity: Predator

Objectives:

To identify and determine the Major Predator of Lac insect and Its Control Measure

Methodology:

Bionomics of E. amabilis was carried out both in the laboratory and in the field of BCSIR Laboratories, Rajshahi. In the laboratory, the room temperature ranged from 22-33^OC, while the relative humidity was 68-92%. Mature pupae were collected from brood lac stick and reared in plastic rearing cages (26 cm X15 cm X7.5 cm). Adult predators that emerged, were allowed to lay eggs on the brood lac stick in rearing cages. The open end of the cages were covered with fine cloth and tightened with rubber bands. Egg hatchability was studied in petri dishes. The larval, pupal and adult durations were also recorded in the rearing cages. Observations were made at every twelve hours interval. In the field, three branches were selected from each of the three host plants isolated for the study under field conditions. The selected branches on which eggs laid, kept covered with mosquito- net. Data on observations from egg to adult stages were recorded at twenty-fours interval.

Source of Information: Bangladesh J. Sci. Ind. Res. 44(1), 57-64, 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

The maximum longevity of a female moth was found to be 23 days in February, but it was 1 day shorter in June and December. In the case of male moth, the maximum longevity was 21 days in February, only I day less than in June and October. The mean longevity of a female was 7.9 + 0.37 and in male 7.3 + 0.31 days 1. The whole crop excluding portion intended to be used as brood lac should be kept under water for 2-4 days and then taken out and allowed to dry completely preferably in the shade. If the sticks are examined, not a single living predator or parasite will be found on the sticks. 2. Selected predator and parasite free brood should be used for every crop. Self inoculation should be avoided. 3. Brood lac should be removed as soon as the tree is sufficiently covered by the lac insects in order to prevent continuation of the life cycle of E. amabilis which could attack crop during swarming period.

Knowledge Management: Journal