Listronotus bonariensis

Argentine Stem Weevil

Other common names:

ASW.

 

Description:

Argentine Stem Weevil have 8 lifecycle stages consisting of 4 instars. The adult Argentine Stem Weevil, which are dark grey to black in colour and have a distinctive protruding snout, lay eggs within the turfgrass canopy under the sheath of the leaf blades. Once the eggs hatch, the larvae (first instar) begins feeding on the inside of the plant stems, until the 2nd or 3rd instar, where they then burrow out of the plant and fall to the ground. At this stage they then feed on the plants crowns and growing points causing significant damage. The older instars live in the thatch and feed on the roots. After the fifth instar is reached the larva pupates within the upper soil profile and the adult soon emerges. The cycle then begins once again with the adults laying eggs from July. The larvae are more destructive than the adult Argentine Stem Weevil.

 

Susceptible Turf:

Warm-and cool-season turfgrasses.

 

Symptoms:

Water stressed appearance in late spring/summer.

 

Control options:

  • Pesticides: To control the larvae and adults, it is best to use a combination of suitable adulticide (e.g. a synthetic pyrethroid product) and a larvicide. See available tabs below for registered products. Use as per label instructions.
  • Integrated Pest Management (IPM): Use a combination of approaches listed on this page.
  • Cultural: Nil.
  • Mechanical: Nil.

 

Disclaimer:

Turf Finder or its developer accepts with no responsibility for any consequences whatsoever resulting from the use of any information or product(s) listed herein. Products are to be applied as per label instructions.

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