The Comparison of Emamectin Benzoate and Abamectin
Emamectin benzoate is a new type semi-synthetic antibiotic effective insecticide abamectin B1 from the fermentation product synthesis, ultra-efficient, low toxicity (nearly non-toxic formulations), no residue, pollution-free, just like other biological pesticides, compared with avermectin, firstly its insecticidal activity is higher by 1-3 orders of magnitude, extremely strong against lepidoptera pole larvae and many other pests and mites, of both stomach toxicity and contact toxicity, very effective at very low doses (0.084-2g/ha), and unharmful to beneficial insects, beneficial for the comprehensive control of pests. In addition, it expanded the insecticidal spectrum and reduced the toxicity to humans and animals.
We know that emamectin benzoate is an upgraded avermectin product, and its activity is much higher than avermectin, such as its stomach toxicity is 2146 times as avermectin. So in general, emamectin benzoate is far more effective than avermectin, and it’s supposed to have better effect than abamectin on diamondback moth control. But we found a strange phenomenon during production, that is, avermectin is better at diamondback moth prevention than emamectin benzoate, why?
Another important property of avermectin series is involved here, that is the positive temperature coefficient rule. Simply put, avermectin series of insecticidal pest virulence (especially stomach toxicity) increases with increasing temperature. However, emamectin benzoate is inconsistent with avermectin in terms of virulence increasing along with temperature: when the temperature is 16°C, the activity of emamectin benzoate is 2-3 times as the same content of avermectin; when the temperature is 16°C~22°C, the virulence of avermectin (all referring to stomach toxicity) increased by about six times while the virulence of emamectin benzoate only increased 2-3 times, that is the same content (pay attention that it is the same content) avermectin and emamectin virulence is actually comparable when the temperature is about 22°C. But we know that the use of avermectin level for production is generally higher than emamectin (emamectin benzoate mostly at 1% or 0.5% while avermectin at generally 1.8% or 2%) , and the dilution ratio of emamectin benzoate is generally higher than avermectin (1000-1500 times for avermectin, 2000-3000 times for emamectin benzoate), that led to the effective use of content in avermectin is actually much higher than emamectin benzoate; as a result, the effect of avermectin seems to be superior to emamectin benzoate at about 22°C.
As the temperature rises to above 25°C, the virulence of emamectin benzoate is greatly increased, even increased by more than 1,000 times while the virulence increase of avermectin is limited (by a range from several times to 10 times), when the advantage of emamectin benzoate can really be brought into full play. Leaf borer usually occurs above 28-30°C, so the effect of emamectin benzoate should be much better than the avermectin to prevent leaf borer. Spodoptera generally occurs at the time of high temperature and drought, which is the annual July~October period (midsummer), so the effect of emamectin benzoate is undoubtedly far better than avermectin.