If using the same concentration of a botanical pesticide (e.g. LC99 level) against the same insect pest, but with different test objectives, then why show different results?
For example, when I tested a botanical pesticide at LC99 level against the oviposition activity of Spodoptera female, it was found that caused inhibited female oviposition by 100%. However, also at the LC99 level in the toxicity test, the mortality of Spodoptera neonate could not lead to death up to 100%.
Can you provide answers and journal references to me?
Thank you.
Mortality and oviposition activity are different parameters. What are the objectives of your research ?
Yes, Mr. Charles is right...
Oviposition is influenced majorly by physical and chemical factors and mortality is influenced by insect age, chemical, climatic conditions, resistance power in insects against treated insecticides, doses of insecticides, and MOA insecticides, etc.
A low amount of insecticide a.i can play a good role in oviposition but can not give good mortality...
The assessment of the effects of botanical pesticides based on
LC99 or LC 90 or LC50 may vary from stage to stage for the same
insect species. For example, the young larval stages are very
sensitive to pesticide products, whether chemical or of
botanical origin, compared to the old stages of the same
species, because the mechanisms of tolerance and / or
resistance of the old stages are more important than
the young stages. Besides, the mechanism of action on
oviposition is quite different. The products can act on
females either by contact or during ingestion or by inhalation.
Other factors can also influence the LC.
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