Results 251 to 260 of about 36,986 (299)

Mode of action of natural insecticides

1969
Nicotine is an autonomic blocking agent, and acts like acetylcholine but only at ganglia and neuromuscular junctions, initially stimulating then depressing them. Those symptoms caused by applied acetylcholine which resemble those in nicotine poisoning are called “nicotinic”.
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Insecticidal and cytotoxic effects of natural and hemisynthetic destruxins

Comparative Biochemistry and Physiology Part C: Pharmacology, Toxicology and Endocrinology, 1994
The insecticidal and cytotoxic effects of 13 natural and hemisynthetic destruxins have been studied. DE shows insecticidal effects similar to those of DA, while DE and DA are more active than all the other natural compounds and analogues tested. Brominated destruxin is a relatively active analogue displaying particular modalities of cytotoxic effects ...
Dumas, C., Robert, P., Pais, M., Vey, A., Quiot, J.M.   +4 more
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Natural Insecticide Pyrethroids Project

2010
Word “Natural” is very popular today. Every advertisement tries to use it to attract consumers. The average consumer misguided by wording, thinking that it is safe, starts using the insecticides inaccurately as in the example of Amber Nickol published in “‘Safe’ Insecticides Now First in Poisoning” article by M. B. Pell and Jim Morris.
Kirichenko, Elmira, Kuravsky, Diana, Truong, Andrew, Fagan, Julie M.   +3 more
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Risks From Natural Versus Synthetic Insecticides

Annual Review of Entomology, 1994
For centuries humans have used natural insecticides to combat insect pests that compete for our food and fiber or that affect public health. Some of these compounds were plant extracts or plant parts, others were mined from the earth. In the twentieth century synthetic insecticides have replaced natural ones as the standard means of controlling ...
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Recovery of natural insecticides fromTephrosia vogelii.

Economic Botany, 1966
Bioassays, using guppies as a test animal, were conducted onTephrosia leaf extracts of seven plants obtained by four different extraction methods. The total rotenoids recovered by acetone extraction of fresh leaves appeared to have slightly more effective piscicidal properties than rotenoids recovered by acetone extraction of oven-dried leaves.
Donald K. Barnes, Ruben H. Freyre
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Insecticide Resistance in Natural Enemies

2016
Pesticide resistance in pests has severe negative consequences but can be used as a positive trait for natural enemies as an opportunity to improve the simultaneous use of two very valuable tools in pest management: chemical and biological control. Biological control adoption is limited in some areas, crops, or seasons due to the imperative use of ...
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Natural Products as Insecticidal Synergists

Natural products are emerging as valuable tools in insect pest management, particularly as synergists that enhance insecticidal activity while potentially reducing chemical usage and mitigating resistance. This chapter explores the role of natural products in boosting the efficacy of both synthetic and botanical insecticides. First, the chapter focuses
Junho Yoon, Hyoeun Jeon, Jian Hong, Jun-Hyung Tak   +3 more
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PHOTOTOXINS AS INSECTICIDES AND NATURAL PLANT DEFENCES

Memoirs of the Entomological Society of Canada, 1991
AbstractThe thiophenes alpha-terthienyl and methyl-alpha-terthienyl are found in many species of the family Asteraceae and are highly phototoxic to mosquito larvae. These compounds and a synthetic analogue, cyano-alpha-terthienyl, controlled Aedes intrudens Dyar (Diptera: Culicidae) larvae at application rates between 10 and 40 g per hectare in field ...
Paul G. Fields, John T. Arnason, Bernard J.R. Philogène, Richard R. Aucoin, Peter Morand, Chantal Soucy-Breau   +5 more
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Effect of Insecticides on Natural Enemies in Groundnut

Indian Journal of Entomology
The most significant effect of inadvertent application of pesticides has been the eradication of natural enemies. It is necessary to assess the insecticidal qualities, mammalian toxicity, and safety to natural enemies before incorporating in IPM. This study evaluates the impact of some insecticides on natural enemies of groundnut defoliators viz ...
Kolli Bharghavi, Rohini Sugandi, Burjikindi Madhuri, R. Channakeshava, Basavaraj S. Yenagi   +4 more
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Insecticides in Nature, Naturally Occurring Insecticides in Cruciferous Crops

Journal of Agricultural and Food Chemistry, 1964
E. P. Lichtenstein, D. G. Morgan, C. H. Mueller   +2 more
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