S. N. Alam
Chief Scientific Officer
Entomology Division, BARI, Gazipur
F. Khatun
Scientific Officer
Entomology Division, BARI, Gazipur
M. Mahmudunnabi
Scientific Officer
Entomology Division, BARI, Gazipur
M. I. Khalil
Senior Scientific Officer
Ispahani Bio-tec, Konabari, Gazipur
Studies were undertaken on the effect of temperature and different diet on the growth and development of predatory earwigs, Euborellia annulata in the IPM laboratory, BARI and Ispahani Bio-tech laboratory, Konabari, Gazipur during November 2012 to March 2013. Egg laying stops when the temperature falls below 20 0c. Nymphal mortality was also high in the low temperature. Adult mortality was high in the low temperature (less than 18 0C, but it is not as high as like nymphs. Maximum of the adult take shelter in the depth of soil and passed the cold winter period. Those adults became normal (start egg laying) when the temperature goes beyond 20 0C. Lowest no. of egg laying, highest nymphal and adult mortality happened in poultry feed, fish feed and cat feed alone. However, earwigs can survive well in artificial food + live insect (even only live insect like mealy bug).
Temperature, Diet, Growth & Development, Predatory Earwigs
Pest Management
To know the effect of temperature and different diet on the growth and development of predatory earwigs, Euborellia annulata
a) Temperature effect on growth and development of earwigs: This experiment was done at IBT, Konabari, Gazipur during November 2012 to March 2013. Five pairs of earwigs were kept in a plastic pot (6.0” diameter and 6.0” height) having 3-4 kg organic matter mixed soil in the pot with sufficient moisture. Proper food of earwigs were supplied everyday. Requisite amount of water were also supplied everyday. One set of pots were then kept in rack in a temperature control room having temperature range from 24.0±2.00C. On the other hand another set of pots prepared in the same way and kept them in a rack placed outside the room having normal temperature. The number of egg laid/female, number of dead and alive nymphs and number of dead and alive adult were counted and recorded from the pots kept in controlled temperature and that of normal temperature.
b) Effect of different food/diets on the growth and development of earwigs: This experiment was done at IPM Laboratory, Entomology Division, BARI, Gazipur and also at IBT lab. at Konabari, Gazipur during August 2012 to November 2012. Two pairs of earwigs were kept in a Petridis having organic matter mixed soil along with the tested food/diets. Nine different types of food/diet alone or in combination were tested on the growth and development of the earwigs. The growth and development stages of the released earwigs were observed and the number of egg laid/female, number of dead and alive nymphs and number of dead and alive adult were counted and recorded from the Petri dishes kept in controlled temperature.
Annual Report 2012-2013, Entomology Division, BARI , Gazipur
50,000.00
Egg laying stops when the temperature falls below 20 0c. Nymphal mortality was also high in the low temperature. Adult mortality was high in the low temperature (less than 18 0C, but it is not as high as like nymphs. Maximum of the adult take shelter in the depth of soil and passed the cold winter period. Those adults became normal (start egg laying) when the temperature goes beyond 20 0C. Lowest no. of egg laying, highest nymphal and adult mortality happened in poultry feed, fish feed and cat feed alone. However, earwigs can survive well in artificial food + live insect (even only live insect like mealy bug).
Report/Proceedings