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Biocides that attack only insects
Date:6/28/2011

have any disadvantage with respect to resistance. Nicotinoids are applied particularly in horticulture, because they are safer for bees. Pyrethroids are the most commonly used, being characterised by their low toxicity towards mammals, although are toxic to bees and aquatic organisms.

Moreover, the researcher intensified the activity of the pyrethroids, including piperonyl butoxide (Pb) in the microencapsulation. This is a substance that increases the efficacy of this insecticide between 10 and 150 times. Within the study she also managed to encapsulate tebuconazole fungicide.

As regards microencapsulation itself, the researcher opted for cyclodextrine-type (CD) carbohydrates as an encapsulating agent. Carbohydrates have high aqueous solubility, little tendency to absorb humidity, a high average lifespan at ambient temperature and are low cost. Cyclodextrines, in concrete, are cyclical dextrines obtained from the partial hydrolysis of maize starch. Also, a yield greater than 99 % was obtained in the formation of microcapsules, on applying a method for dissolution with organic solvents optimised in the laboratory where the research was undertaken.

Less detectable for insects

As was concluded in the thesis, thanks to the micrometric size of the encapsulations obtained, the product has the advantage of being able to treat a greater surface area and being less detectable for insects. Moreover, thanks to the CD protecting the biocide, its toxicological profile is neutralised and its degradation through storage reduced. Besides, on enhancing the solubility of the compound (and thus it being possible to prepare the commercial product based on water) the use of petroleum-derived solvents is avoided, enabling the manufacture of products that are more environmentally-friendly. Finally, the difficulty arising in handling liquid biocides at ambient temperature is overcome with the formation itself of these microencapsulations. '/>"/>

Contact: Amaia Portugal
a.portugal@elhuyar.com
34-943-363-040
Elhuyar Fundazioa
Source:Eurekalert

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