Emamectin benzoate is a new and
efficient semi-synthetic antibiotic pesticide synthesized from fermentation
product avermectin B1, it has super-efficient, low toxicity (almost non-toxic
formulation), no residue, pollution-free pesticides and other biological
characteristics, compared with avermectin, first, its insecticidal activity increased
1-3 orders of magnitude, with high activity to the larvae of Lepidoptera and
many other insects and mites, both have stomach toxicity effect and contact
action, has a good effect at very low doses (0.084-2g/ha), and no harm to beneficial insects in the process of pest
control, it is beneficial for integrated pest control, in addition to expanding
the insecticidal spectrum, reducing the toxicity to human and animal.

We know that the emamectin
benzoate is an upgrade product of avermectin, and its activity is much higher
than avermectin, such as its stomach poisoning toxicity is 2146 times of
avermectin. Therefore, in general, the effect of emamectin benzoate is significantly
better than abamectin, while controlling diamondback moth, emamectin benzoate is
supposed to be better than avermectin. However, abamectin manufacturer has found a strange phenomenon in the production, that is, the
effect of avermectin control diamondback moth is better than emamectin benzoate,
what is the reason?

Here is involved an another
important property of avermectin family, that is positive temperature coefficient.
Simply, the insecticidal toxicity of avermectin family to insects was increased
with (especially stomach toxicity) the temperature increased. However, the rate
of emamectin and abamectin virulence increase with temperature increasing is inconsistent. At 16,
the activity of the same content emamectin benzoate is 2-3 fold of avermectin,
from 16 to 22,
avermectin virulence (refer stomach toxicity) increased six times, the
virulence of emamectin benzoate only increases 2-3 times, that is in about 22,
the virulence of the same content (Note that the same content) avermectin and
emamectin benzoate is actually comparable. But we know that the use of
avermectin levels in the production are generally higher than emamectin
benzoate (emamectin benzoate production is mostly 1% or 0.5%, while avermectin is
generally 1.8% or 2%), the dilution factor is generally the emamectin benzoate higher
than avermectin (avermectin 1000-1500 times, emamectin benzoate 2000-3000 times),
it leads to the real use of avermectin effective content is much higher than
emamectin benzoate, resulting in about 22,
the effect of avermectin was seemed to be superior than emamectin benzoate. We
know the most suitable temperature of diamondback is precisely about 22,
that is in this temperature the moth will outbreak, so there will be appeared
the situation that the effect of emamectin benzoate control diamondback moth is
better than avermectin.

As the temperature rises, to
above 25, the virulence of emamectin greatly
increased, even can increase 1000-fold or more, and the virulence of avermectin
was limited increased (several times to 10 times). So this time the advantage
of emamectin benzoate actually get to play. Leaf borer incidence is generally
28-30 or more, so to prevent leaf borer, the
effect of emamectin benzoate should be much better than avermectin. The
occurrence of Spodoptera is generally in hot and dry day, it is in annual July-October
period (summer), the effect of emamectin benzoate is better than avermectin.

Source:http://www.cospcn.com

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