https://jopr.mpob.gov.my Wed, 17 Nov 2021 07:26:06 +0000 en-US hourly 1 https://wordpress.org/?v=7.0 https://jopr.mpob.gov.my/effect-of-bt-products-lepcon-1-bafog-1s-and-ecobac-1ec-against-the-oil-palm-pollinating-weevil-elaeidobius-kamerunucus-and-beneficial-insects-associated-with-cassia-cobanensis/ Sat, 13 Nov 2021 08:03:40 +0000 https://jopr.mpob.gov.my/V2/?p=9032 The effects of Bacillus thuringiensis products, Lepcon-1, Bafog-1 (S) and Ecobac-1 (EC), on the oil palm pollinating weevil, Elaeidobius kamerunicus, and beneficial insects, especially parasitoids, were studied. For pollinating weevils, oil palm male spikelets with weevils were treated by spraying with Lepcon-1 and Ecobac-1 (EC) at five different concentrations, ranging from 5.2 x 107 to 5.2 x 10¹¹ cfu ml^-1 for Lepcon-1, and 7.34 x 107 to 7.34 x 1011 cfu ml^-1 for Ecobac-1 (EC). For Bafog-1 (S), male spikelets with weevils were fogged at a dose of 7.7 x 10¹¹ cfu ml^-1. The Bt products Lepcon-1, Bafog-1 (S) and Ecobac-1 (EC) were safe for E. kamerunicus. Direct spraying of Lepcon-1, Bafog-1 (S) and Ecobac-1 (EC) at the highest concentrations caused 13%, 10% and 11% corrected mortality at nine days after treatment (DAT), respectively. Cypermethrin was toxic to the pollinating weevils as it killed 100% of the weevils at as early as five DAT. Lepcon-1, Bafog-1 (S) and Ecobac-1 (EC) were also harmless to beneficial insects. Application of these products by spraying at the highest concentrations resulted in low mortality of the beneficial insects, ranging from 8% to 13%. Cypermethrin was toxic to the parasitoids as spraying of the chemical at 7.5% w/w killed 100% of the beneficial insects at as early as five DAT. The laboratory study showed that Lepcon-1, Bafog-1 (S) and Ecobac-1 (EC) were safe for the oil palm pollinating weevils and beneficial insects and, therefore, they are recommended for use in the integrated control of bagworms in oil palm.

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