Scientific name:
Isaria fumosoroseus strain FE 9901
Common name:
entomopathogenic fungus
Isarid 1
Isarid 3
Use for

Use for

When to use ISARID?

Apply at first symptoms of pest attack. Minimum 3 applications at 5-7 day intervals or shorter in severe infestations.

How it works

How it works

How does ISARID work?

When spores of ISARID come into contact with the insect pest they attach to the body and begin to grow almost immediately. Once the spore germ tube penetrates the host cuticle, fungal multiplication takes place through formation of hyphal bodies in the host body. The ISARID microbe mechanically disrupts the host’s internal organs and initiates tissue necrosis. This leads to lack of feeding, inactivity and eventually death.

Product specifications

Product specifications

2lb container 

10lb container 

Directions for use

Directions for use


ISARID is registered for sale in the following U.S. States and territories:

  • AK, AR, AZ, CA, CO, CT, DC, DE, FL, GA, IA, ID, IL, IN, KS, KY, LA, MA, ME, MD, MI, MN, MO, NC, NH, NJ, NM, NV, NY, OH, OK, OR, PA, SC, TN, TX, UT, VA, VT, WA, WI, WV

Application ISARID

  • ISARID can be used on vegetables, ornamentals, herbs and medicinal plants in the greenhouse or in other indoor growing facilities
  • ISARID can be used on agricultural crops such as, strawberries, blueberries, citrus, cucurbits, peppers, and tomatoes.
  • Apply at first symptoms of pest
  • Can be applied through a Dramm® Cold Fogger
  • Treatments should be directed to all areas of the plant where the insect feeds, hatches, and lives
  • Apply 2 lbs per acre
  • ISARID can be applied anytime throughout crop cycle, even at harvest


  • Not recommended to be applied through a pulse or heat-generating fogger
  • In case of heavy infestations, combination with a standard

Best working conditions ISARID

Optimal humidity for growth of I. fumosoroseus FE 9901 is 50% or greater. If humidity is below 50%, schedule application immediately after general watering or irrigation. ISARID is unaffected by pH ranges from 4.0-9.0.

The information given below is merely indicative. Tailored advice can be provided if information is available on the local factors that need to be taken into account, such as the crop, the climate conditions and the level of infestation. For the correct approach, please consult a Koppert specialist or a recognized distributor of Koppert products.

ISARID preventive light curative heavy curative
<p>Volume Foliar Rate 16 oz/100 gal 16 oz/100 gal 32 oz/100 gal
Area Foliar Rate 1 lb/acre 1 lbs/acre 2 lbs/acre
Drench Rate 14 oz/100 gal 21 oz/100 gal 28 oz/100 gal
Interval (days) 7-14 5-7 3-5
Frequency As needed 3-4x or until control is achieved 3-4x or until control is achieved
Remarks - - -</p>

Side effects

Pesticides can have (in)direct effects on biological solutions. Find out which pesticides have side effects on this product.

Go to side effects database
Product handling

Product handling


Biological beneficials have a very short life expectancy and therefore need to be introduced into the crop as soon as possible after receipt. Failure to do so can have a negative impact on their quality. In case you do need to store ISARID, please follow the instructions below. Koppert is not liable for any loss of quality if the product is stored for longer and/or under different conditions than recommended.

  • Protect from extreme heat and cold
  • Isarid will last longer in a refrigerated environment (46Fº)
  • Always check expiration date stamped on the product itself

"The general conditions of Koppert (Koppert B.V. and/or of its affiliated companies) apply. Only use products that are permitted in your country/state and crop. Always comply with the conditions specified in local product registrations. Koppert cannot be held liable for unauthorized use. Koppert is not liable for any loss of quality if the product is stored for longer than recommended and/or under incorrect conditions."