Keyun®SfMNPV is based a naturally occurring pathogenic virus, Spodoptera frugiperda multiple nucleopolyhedrovirus (SfMNPV) that infects and kills only larvae of Spodoptera frugiperda(fall armyworm).
Spodoptera frugiperda(Fall armyworm)
How it works
When Keyun®SfMNPV is applied to crops and ingested by pests, the virions are released and replicate massively in the pest's body, and then spread throughout the body while rapidly consuming body tissues. Spodoptera frugiperda that ingest the virus become lethargic during their sickness caused by the virus infection, and appear sublethal. Eventually, they will die with their internal organs and tissues liquefied. In addition, the virions will continue to spread like a plague between and through several generations of Spodoptera frugiperda through the fluid or feces of the dead Spodoptera frugiperda larvae, providing effective long-term control of the Spodoptera frugiperda population.
Direction for use
The homogenously diluted solution can be made by premixing Keyun®SfMNPV with a small amount of water and vigorously agitating before adding to the tank. Spray water pH should be neutral(pH7.0). Spray water pH above 8 may damage the virus and performance will be reduced. If mixing with other pesticides or foliar fertilizers in water, add Keyun®SfMNPV to the spray tank after the other products are thoroughly diluted. Giperdax should be applied as soon as possible after mixing. The virus can be rendered inactive if the mixture is left to stand overnight.
Rates and Dilution Rates
Corn, Sweet Corn, Cotton, Sugarcane, Peanut and Vegetable Crops etc
Keyun®SfMNPV can be applied at the low label rate (600ml)as preventative, or when pest pressure is low. If pest pressure is high, or the overlapping is serious, Keyun®SfMNPV can be applied at high label rate(750ml) OR by mixing or rotate with another insecticide that will provide more rapid knock-down of Spodoptera frugiperda.
Multiple sprays at low rates and short intervals are likely to provide better control than a single spray at high rate.
1. The dilution rates depend on local habit and experience of farmers and spray equipment.
2. If possible,
the less the water amount is, the better the control efficacy will be.
Keyun®SfMNPV can be applied using standard ground sprayers, aerial application, and overhead sprinkler chemigation. Apply Keyun®SfMNPV in sufficient water to obtain thorough coverage of the crop canopy without excessive runoff. Actual application volume will depend on the type of spray equipment used. It is advised to use nozzles with Ultra-low volume spraying to ensure thorough coverage of the target area.
Keyun®SfMNPV must replicate within the host larva in order to be effective, so Keyun®SfMNPV is slower to kill larvae compared to many chemical insecticides. Several days may elapse between treatment and cessation of larval feeding due to virus infection. Larvae may cause considerable damage as they continue to feed even if they eventually succumb to virus infection. Therefore, Giperdax applications should be targeted against FIRST OR SECOND INSTAR LARVAE in order to avoid the occurrence of extensive damage. The subsequent applications should be made at 3-6 days interval depending on the eggs counts and crop growth rate due to the short residual activity of virus.
Keyun®SfMNPV can be applied alone against Spodoptera frugiperda if Spodoptera frugiperda is a key pest or when non-target pests do not reach economic threshold. However, Giperdax is highly compatible with the majority of herbicides, insecticides fungicides and foliar fertilizers in order to provide a broader spectrum of control(including more rapid knock-down effect), to kill moths and eggs as well as larvae, or to control Spodoptera frugiperda larvae resistant to chemical insecticides. Giperdax will infect and kill both susceptible and resistant larvae. Ensure that the mixture has a pH of 7 or less. Mixing Keyun®SfMNPV with alkaline substances will damage the virus.
Rain Fastness and Use of Spray Adjuvants
The majority of virus uptake by larvae occurs within 1 hour post-application. For this reason, it is best to avoid applying Keyun®SfMNPV if heavy rain is expected within one hour following applications. However, do not delay application if only moderate rain is expected, or heavy rain is not imminent. Use of spreader/sticker and ultraviolet screening agent can enhance the performance of Keyun®SfMNPV. Additional protection, as well as enhanced spray deposition and rain fastness, may be obtained by using certain latex, mineral oils and powdered skim milk. Avoid mixing Keyun®SfMNPV with silicone-based adjuvants intended only as spreader. Such compounds may interfere with the natural ability of the virus to stick to plant surfaces.
Temperature conditions during Transport
Storage Time at Different Temperatures