Lethal and toxic effects of some botanicals against the larvae of Tribolium castaneum (Herbst)

Md Adnan Al Bachchu*, Kismot Ara, Roushan Ara, Md Nizam Uddin and Mohammad Mosharof Hossain Bhuyain

*Corresponding author: adnan@hstu.ac.bd 

Department of Entomology, Hajee Mohammad Danesh Science and Technology University, Dinajpur 5200, Bangladesh.

Article history: Received: 11.01.2021, Accepted: 28.04.2021, Published: Online: 30.04.2021

To cite this article: Bachchu MAA, Ara K, Ara R, Uddin MN and Bhuyain MMH. 2021. Lethal and toxic effects of some botanicals against the larvae of Tribolium castaneum (herbst). Int. J. Agric. Med. Plants. 2(2): 24-32


A study was carried out on the lethal and toxic effects of neem, thorn apple, custard apple and castor plant extracts at 12, 24, 36, 48, 60 and 72 hour after treatment (HAT) interval against the 3rd and 4th instar larvae of red flour beetle, Tribolium castaneum (Herbst) in the ambient laboratory conditions. Five doses viz., 1.77, 0.88, 0.44, 0.22, 0.11 and 3.54, 1.77, 0.88, 0.44, 0.22 along with control were made with methanol solvent for the 3rd and 4th inatar larvae, respectively. Larval mortality of castor plant extract showed the highest toxic effect in both the larval instar (3rd and4th.) (average mortality 47.60% and 47.75%, respectively) whereas the lowest toxicity was found in the thorn apple leaf extracts (average mortality 20.14% and 30.26%, respectively). The larval mortality was significantly differed among all the concentrations of the plant extracts applied. The highest mortality of 96.67% was recorded at the concentration of 1.77 mg/cm2 in both 3rd and 4th larval instar at 72 HAT in castor plant extract. No larval mortality was observed in untreated control up to 72 HATs. Mortality percentage was also observed directly proportional to the level of concentrations of plant extracts and to the exposure period.

Keywords: Insect mortality, laboratory, larvae, plant extract, Red flour beetle


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