Exhibitline hb Heterorhabditis bacteriophora

  • Exhibitline hb image
  • Exhibitline Hb image

Exhibitline Hb biological control agent contains the insect pathogenic nematode, Heterorhabditis bacteriophora, as infective juveniles. It is used to control black vine weevil larvae in ornamentals and berries. It is also used for curative chafer grub control in turf.

Key Features

  • Provides at least 4 weeks of protection from black vine weevil and strawberry root weevil
  • Provides effective curative control of Chafer grub in turf
  • Heterorhabditis bacteriophora  will actively seek out vine weevil and chafer grub larvae in the coil.
  • Simple and safe to use, bacteriophora occurs naturally in soils.
  • Apply through ground sprayers or irrigation
  • Apply anytime whenever ground temperatures are above 12oC

Main uses

  • Black vine weevil (Otiorhynchus sulcatus)
  • Strawberry root weevil (Otiorynchus ovatus)
  • Chafer grub (Phyllopertha horticola)

How It Works

Harmless to the ornamental crops, humans, the environment and other beneficial insects, these nematodes actively seek out vine weevil larvae by swimming in the thin film of water on soil particles.  They locate hosts by detecting carbon dioxide and other waste products. After locating pest larvae, nematodes invade through natural body openings and inject bacteria into the insect. Bacteria develop within the insect and it dies of septicemia.  
Under optimum conditions, the insect can die within 12-24 hours. Insect mortality will depend on the environmental temperature. The minimum soil temperature should be 12°C for nematodes to work most efficiently and the maximum soil temperature should be no more than 26°C.

Available delivery systems

Exhibitline Hb is available in units of 50 million, 250 million entomopathogenic Heterorhabditis bacteriophora nematodes in an inert carrier in sealed trays.

Handling & Storage

Instruction for use

  • Apply early morning or late evening to minimize the effect of heat and sunlight. Turn off artificial lights which may dry plant surfaces too quickly.
  • The soil surface should be moist at the time of application.
  • Apply with at least 4 litres / m2 water if applied direct to soil, for Chafer Grub 1,200 l/ha.
  • For drench applications over foliage use lower volumes of water and irrigate within 30 minutes of treatment with at least 1 litre/ m2 to wash nematodes off the leaves and below the soil surface.
  • For optimum results, keep the soil moist for 3-4 weeks after application.
  • The entire spray solution should be applied once mixed. Do not store for longer than 4 hours.
  • Remove all fine filters in the tubing and at the nozzles. Use nozzles with at least 0.8 mm diameter.
  • Keep nematode solution agitated continuously; alternatively add carboxy-methyl cellulose (wallpaper paste) at 0.4% w/v to prevent nematodes settling, mixture should still be used within 4 hours.
  • Do not exceed a pump pressure of 20 bar/ 300psi, for Dosatron 6 bar/ 100psi.
  • For detailed instructions on application techniques, download the technical sheet or consult your Bioline advisor for more information.

For control of black vine weevil larvae (Otiorhynchus sulcatus) in ornamentals and berries.

  • Apply from end of March to the end of May for treatment of vine weevil larvae which have developed during winter and from August to mid-October against larvae which have developed from eggs laid in late spring.
  • Routinely treat new material coming onto the nursery that may contain vine weevil larvae.
For control of chafer grub larvae (Phyllopertha horticola) in turf.
  • Apply from end of July to the end of September as a curative treatment when the young grubs can be found close to the surface of the soil.
  • Apply with at least 1,200 litres water / ha.


  • Avoid mixing with pesticides and adjuvants (wetting agents) unless compatibility checked.
  • Ask your supplier; otherwise avoid application 1 week before and 2 weeks after application of pesticides.
  • DO NOT mix with fertilizers. However, fertilization directly before or after application will not be a problem.

Storage and transport

  • Use as soon as possible upon delivery.
  • Use the entire pack at one time.
  • The product may be stored for a limited period of time at 4 to 8°C. (See expiry date on the package).
  • Store bags in a refrigerator without the box; In a cool storage room - open the carton but not the bag.