Insecticidal Effects of Fumigants (EF, MB, and PH) towards Phosphine-Susceptible and -Resistant (Coleoptera: Curculionidae).

This study was conducted to evaluate the insecticidal effects of ethyl formate (EF), methyl bromide (MB), and phosphine (PH) fumigants against PH-susceptible and -resistant strains of the rice weevil (), a major rice pest. The highest lethal concentration time 50 (LCt) values of the PH-susceptible strains were 255.797, 21.

Acaricidal and Insecticidal Activities of Essential Oils against a Stored-Food Mite and Stored-Grain Insects.

Twenty plant-derived oils were evaluated for their acaricidal and insecticidal activities against Sitotroga cerealella, Sitophilus oryzae, Sitophilus zeamais, and Tyrophagus putrescentiae adults, by using the fumigant and filter paper diffusion methods. Responses varied with bioassay systems, insect or mite species, plant oils, and exposure time. Based on the 50% lethal dose (LD50) values against S.