Abstract
The screening of several Chinese mangrove plants for insecticidal principles showed that ethanol extract of Ceriops tagal stems and twigs possessed significant feeding deterrent activity against the red flour beetle, Tribolium castaneum (Family: Rhizophoraceae). From the ethanol extract, three feeding deterrent diterpenoids were isolated by bioassay-guided fractionation. The compounds were identified as tagalsin A, B, and H on the basis of their phytochemical and spectral data. Tagalsin A, B, and H exhibited strong feeding deterrent activity against T. castaneum adults with EC50 values of 375.3 ppm, 277.3 ppm, and 285.45 ppm, respectively.
Highlights
The red flour beetle [Tribolium castaneum (Herbst)] is one of the most widespread and destructive primary insect pests of stored cereals [1]
Control of stored product insects relies heavily on the use of synthetic insecticides and fumigants, which has led to problems such as disturbances of the environment, increasing costs of application, pest resurgence, pest resistance to pesticides and lethal effects on non-target organisms in addition to direct toxicity to users [5]
We report the isolation and identification of three feeding deterrents contained in C. tagal stems and twigs against T. castaneum by bioassay-guided fractionation
Summary
The red flour beetle [Tribolium castaneum (Herbst)] is one of the most widespread and destructive primary insect pests of stored cereals [1]. Control of stored product insects relies heavily on the use of synthetic insecticides and fumigants, which has led to problems such as disturbances of the environment, increasing costs of application, pest resurgence, pest resistance to pesticides and lethal effects on non-target organisms in addition to direct toxicity to users [5] These problems have highlighted the need for the development of new types of selective stored product pest-control alternatives. Robinson stems and twigs (Family: Rhizophoraceae) were found to possess significant feeding deterrent activity against T. castaneum This plant is well distributed in Southern China, Eastern Africa, and Oceania [6]. The leaves, when boiled in water, are used as a substitute for quinine to heal paludism [7] The bark of this plant has been used for the treatment of infected wounds in Thailand and for obstetric and hemorrhagic conditions in the Philippines [8]. We report the isolation and identification of three feeding deterrents contained in C. tagal stems and twigs against T. castaneum by bioassay-guided fractionation
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