The usage of synthetic fertilizers/insecticides in conventional
farming has dramatically increased over the past decades. The aim of the study
was to compare the effects of bio-pesticides and insecticides/pesticides on
selected beneficial non targeted arthropods. Orders Collembola, Arachinida/Opiliones,
Oribatida and Coleoptera were the main groups of arthropods found in the organic
fields and Coleoptera, Oribatida, Gamasida and Collembola in conventional fields.
Pesticides/insecticides had a significant effect on non-targeted arthropods
order- Collembola, Arachinida/Opiliones, Hymenoptera and Thysonoptera were suppressed
after pesticides/insecticides spraying. Bio-insecticides in organic fields had
a non-significant effect on non targeted species and they started to increase
in abundance after 7 days of spraying, whereas insecticide treatment in conventional
fields had a significant long-term effect on non targeted arthropods and short
term effect on pests/insects, it started to increase after 21 days of the spraying.
These results indicate that insecticide treatment kept non targeted arthropods
at low abundance. In conclusion, organic farming does not significantly affected
the beneficial-non targeted arthropods biodiversity, whereas preventive insecticide
application in conventional fields had significant negative effects on beneficial
non targeted arthropods. Therefore, conventional farmers should restrict insecticide
applications, unless pest densities reach the thresholds and more desirably
can switch to organic farming practices.
Padmavathy Anbarashan and Poyyamoli Gopalswamy, 2013. Effects of Persistent Insecticides on Beneficial Soil Arthropod in Conventional Fields Compared to Organic Fields, Puducherry. Pakistan Journal of Biological Sciences, 16: 661-670.