EFFICACY OF CERTAIN INSECTICIDES AGAINST RED PALM WEEVIL, Rhynchophorus ferrugineus (OLIVIER) UNDER LABORATORY AND FIELD CONDITIONS.

Abstract

The present work was conducted to evaluate the effect of eight insecticides against red palm weevil (RPW), Rhynchophorus ferrugineus under laboratory and field conditions. The insecticides were studied namely, Chlorpyrifos, Diazinon, Ethion, Fenitrothion, Fipronil, Methomyl, Phenthate and Profenofos. Under laboratory condition results showed that, Chlorpyrifos was the most effective insecticide against the egg stage of RPW, while Fipronil was the most effective one against larval and pupal stage, and Methomyl recorded the highest effect against the adult stages (♀, ♂). At field condition Data revealed that, at the concentration of 3ml/L, all level of the tested insecticides caused 100% recovery expect Methomyl which reached 90% recovery only. Using 2ml/L of the tested insecticides revealed 100% recovery with Fipronil, and 90% with Chlorpyrifos and Phenthoate, while it was 80% with Ethion, Fenitrothion and Profenofos. Diazinon and Methomyl revealed only 60 and 50% recovery, respectively. It worth mentioning that Fipronil seams as the most effective one followed by Chlorpyrifos and Phenthoate.

Biochemical and Histological Responses of Red Palm Weevil, Rhynchophorus ferrugineus Exposed to Sub-lethal Levels of Different Insecticide Classes

“…When taking the nutritional behavior of the insect inside the sugarcane stems, also the weight of the treated larvae "9 th larval instar", requires a higher concentration reaching the median lethal concentration compared to other treatment methods such as the insect immersion method. Perhaps these variations explain the great discrepancy in the results of the bioassay of the RPW, not only at the level of the same phase but also according to the different gender tested as reported (Elgohary et al, 2015).…”

“…Chlorpyrifos estimated LC50 = 2597 µg/ml, against larvae (20 days old) using dipping food technique (Shawir et al, 2014). Chlorpyrifos was an effective insecticide against the egg stage of RPW, and methomyl recorded the highest effect against the adult stages (♀, ♂) (Elgohary et al, 2015). The LC50 of females treated with spinosad was calculated at 44.3 µg/ml.…”

Field Efficacy of Chlorpyrifos in A Chitosan Nanoformulation Against the Red Palm Weevil.Curculionidae) in Date Palm

“…Fifth instar larvae were placed in the box (Ten larvae per box), with 50 larvae for each pesticide concentration (represented by 5 repetitions). Each replicate had ten larvae (Elgohary et al, 2015). After 48 hours, mortality records were collected.…”

CURRENT STATUS, CHALLENGES, MANAGEMENT AND FUTURE PERSPECTIVES OF THE RED PALM WEEVIL Rhynchophorus ferrugineus OLIVIER (COLEOPTERA, CURCULIONIDAE) ERADICATION - A REVIEW

“…Synthetic insecticides are the most common control method used against R. ferrugineus and can apply in several ways. The most commonly used insecticides are chlorpyrifos, fipronil, and methomyl (El-Gohary et al, 2015), emamectin benzoate (Chihaoui-Meridja et al, 2020), imidacloprid (Abd El-Fattaha et al, 2021), and carbaryl (Hernandez-Marante et al, 2003). Insecticidal applications protect fresh injuries from adult' female infestation and prevent egg-laying (Abraham et al, 1998).…”