Results 261 to 270 of about 111,895 (309)

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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Mount St. Helens ash: a natural insecticide

Canadian Journal of Zoology, 1981
Dry volcanic ash from the May 18, 1980 eruption of Mt. St. Helens was lethal to insects. Volcanic ash induced mortality was due to physical rather than chemical properties of the ash. Water loss due to cuticular abrasion and excessive salivation during grooming were the principle causes of death.
John S. Edwards, Lawrence M. Schwartz
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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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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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Marine Natural Products as Prototype Insecticidal Agents

Journal of Agricultural and Food Chemistry, 1997
In an attempt to characterize additional structural classes that could serve as prototypes for insecticides, 26 structurally diverse marine compounds were examined for insecticidal activity in a di...
Khalid A. El Sayed, D. Charles Dunbar, Tony L. Perry, Scott P. Wilkins, Mark T. Hamann, John T. Greenplate, Margaret A. Wideman   +6 more
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Naturally Occurring Insecticides

Soil Science, 1972
Martin Jacobson, D. G. Crosby, A. J. FORGASH   +2 more
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Novel natural product based anti-anxiety therapy and natural insecticides

2013
The EtOH extracts of the leaves of Margraviaceae, a relatively rare Central American vine for which ethnobotanical reports suggested possible anti-anxiety properties, showed significant anti-anxiety activity in animal models for anxiety. Subsequent bioassay-guided fractionation of these extracts yielded an EtOAc active fraction (f1).
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Progress in developing insecticides from natural compounds

1993
Abstract Approximately one third of world food production is lost through damage caused by pests. The most efficient method of controlling insect pests relies on the use of insecticides (compounds which kill insects) many of which act on the insect nervous system.
Bhupinder P S Khambay, Norval O’connor
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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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Chemists synthesize natural insecticide in 16 steps

C&EN Global Enterprise, 2019
Although chemists have known about the molecule perseanol since the 1990s, no one has completed a total synthesis of the complex, polycyclic insecticide, until now. California Institute of Technology chemistry professor Sarah E. Reisman and graduate students Arthur Han and Yujia Tao constructed perseanol in just 16 steps, starting from a commercially ...
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