Maher Fenpropathrin (10% EC)
Mechanism of action:
Fenpropathrin is an acaricide and insecticide which acts via contact and ingestion. It is also a repellant. It interferes with nerve impulse transmission by acting on sodium channels. The synthetic pyrethroids delay closure of the sodium channel, resulting in a sodium tail current that is characterized by a slow influx of sodium during the end of depolarization. Apparently, the pyrethroid molecule holds the activation gate in the open position. Pyrethroids with an alpha-cyano group (e.g., fenvalerate) produce more prolonged sodium tail currents than do other pyrethroids (e.g., permethrin, bioresmethrin). The former group of pyrethroids causes more cutaneous sensations than the latter. This poison has a fast knockdown effect. This effect does not directly relate to the toxic effects of poisoning since the amount of poison required to cause insects mortality is usually much higher than the amount needed to cripple them. The effect of fenpropathrin is like the pyrethrins, causing a rapid drop in the insect. The effect of fenpropathrin is due to nervous inhibition and has a positive correlation with temperature (unlike permethrin). Fenvalerate decreases the sensitivity of the post-synaptic region to neural stimulation. The rate of release of gamma amino-butyric acid (GABA) in the pre-synaptic region increases and prevents the neuronal transmission. Fenpropathrin has a lipophilic property and is easily absorbed by insect cuticle layer and leaf surface, resulting in resistance to the effect of rainwash. Fenpropathrin insecticide property depends on the recommended dosage for each pest and the total coverage of the layer of poison on the surface of the leaf. Besides the knockdown effect, this compound also has the property of deterrent (in high levels of consumption) and lack of nutrition of pests (in low consumption). Furthermore, by preventing the feeding of adult mites and reducing their vital functions, make them reduce eggs.
Indications :
Fenpropathrin is used to control the moving stage of the types of mites with the exception of the quadruped mites (Europhides) and insects such as whiteflies, leaf miner, phyllophagous and stemborer insects, aphids, psyllas on pome fruits, citrus, grapes, vegetables and fruits, cotton, greenhouse and ornamental plants are usable.
Compatibility and Mixing:
So far, there has been no report on the inconsistency of fenpropathrin on mentioned plants in the recommended dosage, though this poison cannot be mixed with alkaline compounds (such as Bordeaux mixture and ...) since the cholinesterase enzyme necessary for the decomposition of acetylcholine in the inter-synaptic space and the removal of this continuous stimulation is blocked by chlorpyrifos.