What are the disadvantages of using Biopesticides
- Slow effect
- Lack persistence and wide spectrum activity
- Rapidly degraded by UV lights so residual action is slow.
- Seasonal availability of plants products indicates the needs for storage.
- They are not available easily
- Poor water solubility and generally not systemic in nature
- All products applied followed by growers have not been scientifically verified.
Bio-pesticides must be effective in controlling the pest(s) that they
are designed to control. Many bio-pesticides are single host specific,
but it is desirable to have a bio-pesticide that can control a wider
range of targets. Researchers believe that biological pesticides may be
less vulnerable to genetic variations in plant populations that cause
problems related to pesticide resistance, which would make them very
appealing by contrast. This has become the greatest concern among those
who rely on these applications. Biological pesticides need to provide
predictable performance standards, and they need to do so inexpensively.
Agriculture and Agri-Food Canada scientists in Saskatoon developed
formulations that may be applied pre-emergence or post emergence to
control common weeds.
Researchers employ a host of strategies often looking for means to
strengthen local, natural enemies or to produce them en masse as
biopesticides. Fungi, insect viruses, competing but harmless strains of
the same pest are being tried, often with great success. Chemicals are
mainly used as herbicides, fungicides and insecticides. These chemicals
characteristically have good storage, relatively wide spectrum of
activity, fast speed of kill, relatively short persistence, so need
frequent applications, and a potential for environmental harm and
toxicological concerns.
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