Tag Archives: Neem EC

465-470 L. Metspalu, K. Jõgar, A. Ploomi, K. Hiiesaar, I. Kivimägi and A. Luik
Effects of biopesticide Neem EC on the Mamestra brassicae L. (Lepidoptera, Noctuidae)
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Effects of biopesticide Neem EC on the Mamestra brassicae L. (Lepidoptera, Noctuidae)

L. Metspalu, K. Jõgar, A. Ploomi, K. Hiiesaar, I. Kivimägi and A. Luik

Estonian University of Life Sciences, Institute of Agricultural and EnvironmentalSciences, Kreutzwaldi Str. 64, 51014 Tartu, Estonia; e-mail: Luule.Metspalu@emu.ee

Abstract:

Third instars larvae of the cabbage moth, Mamestra brassicae L. were exposed to Neem EC (M/S RYM Exports, The Indian Neem Tree Company) by a leaf-dip experiment (concentration of azadirachtin – 100 ppm). The after-treatment parameters studied the duration of the larval stage, mortality, and weight of pupae. Neem EC has shown significant prolongation in the development of larvae of M. brassicae: 18.5 days in the test variant, versus 14.8 days in the control. Neem EC also caused lethal failure of larval-larval and larval-pupal ecdysis, which is typical for insecticides possessing morphogenetic activity commonly referred to as IGR-activity. The mortality of larvae, prepupae and pupae in the test variant was significantly higher than in the control. The experiment in laboratory revealed that Neem EC inhibited larval development, greatly increased mortality, had antifeedant/deterrent effects and acted as a growth regulator for M brassicae larvae and pupae.

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341-346 E. Koskor, R. Muljar, K. Drenkhan, R. Karise, A. Bender, E. Viik,A. Luik and M. Mänd
The chronic effect of the botanical insecticide Neem EC on the pollen forage of the bumble bee Bombus terrestris L.
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The chronic effect of the botanical insecticide Neem EC on the pollen forage of the bumble bee Bombus terrestris L.

E. Koskor¹, R. Muljar¹, K. Drenkhan¹, R. Karise¹, A. Bender², E. Viik¹,A. Luik¹ and M. Mänd¹

¹Estonian University of Life Sciences, Institute of Agricultural and Environmental Sciences,Kreutzwaldi Str. 1, Tartu 51014, Estonia; phone: +372 7313396;fax +372 7313351; e-mail: eda.koskor@ut.ee
²Jõgeva Plant Breeding Institute, Aamisepa 1, Jõgeva alevik 48 309, Jõgeva, Estonia

Abstract:

The botanical insecticide Neem EC is allowed for use as a pest control agent in organic farming. Although the preparation is considered safe for honey bees, its effect on bumble bees has been less studied. The aim of this study was to investigate the effect of sublethal chronic doses of the botanical insecticide Neem EC (1% azadirachtin) on the pollen forage of the bumble bee Bombus terrestris L. Four pairs of colonies (one pair consisting of a test and a control colony) were placed at 0, 400, 800 and 1200 m from leguminous fields. Prior to taking the colonies to the field the test colonies were fed with a sublethal dose of Neem EC (0.01 ppm azadirachtin in the food) for a three-week period, whereas the control colonies were fed untreated food. Pollen loads of homing bees were removed and analysed. Our results show that sublethal doses of Neem EC may affect the pollen forage of bumble bees.

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181-186 M. Grišakova, L. Metspalu, K. Jõgar, K. Hiiesaar, A. Kuusik and P. Põldma
Effects of biopesticide Neem EC on the Large White Butterfly, Pieris brassicae L. (Lepidoptera, Pieridae)
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Effects of biopesticide Neem EC on the Large White Butterfly, Pieris brassicae L. (Lepidoptera, Pieridae)

M. Grišakova, L. Metspalu, K. Jõgar, K. Hiiesaar, A. Kuusik and P. Põldma

Institute of Agricultural and Environmental Sciences, Estonian University of Life Sciences,Kreutzwaldi St. 64, 51014 Tartu, Estonia; e-mail: luule.metspalu@emu.ee

Abstract:

The effects of Neem EC (M/S RYM Exports – The Indian Neem Tree Company, 1% azadirachtin) were assessed on the Large White Butterfly, Pieris brassicae – a major pest of cruciferous plants. Duration of the larval stage, mortality of larvae and prepupae, and weight of pupae were studied. The time needed for completion of the larval stages by individuals fed on treated cabbage increased significantly, compared with the control: 16–37 days in the test variant, versus 11–18 days in the control. Neem EC also induced high mortality, caused by lethal failures of larval-larval and larval-pupal ecdysis, which were typical for insecticides possessing morphogenetic activity commonly referred to as IGR-activity. The mortality of larvae and prepupae in the test variant was significantly higher than in the control. Considerably fewer pupae were gained in the test variant than in the control variant. The pupae of larvae that had been feeding on the control were significantly heavier than those of the larvae feeding on the treated plants. The experiment revealed that Neem EC had both toxic and antifeedant/deterrent effects but also acted as a growth regulator for P. brassicae larvae.

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