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Turfgrass Entomology Update Rutgers University Albrecht Koppenhöfer. Research Projects:. Mating disruption of oriental beetle Biological and biorational control of annual bluegrass weevil Steinernema scarabaei for long term white grub suppression

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research projects
Research Projects:
  • Mating disruption of oriental beetle
  • Biological and biorational control of annual bluegrass weevil
  • Steinernema scarabaei for long term white grub suppression
  • Entomopathogenic nematode application and ecology
  • New chemistry for white grubs and annual bluegrass weevil management
slide3

Steinernemascarabaei for long term

white grub suppression

  • isolated from epizootics in Japanese and oriental beetle larvae in turfgrass areas in central NJ
  • biology similar to that of other EPN species
  • appears to be rather specific to white grubs
  • High pathogenicity and high field efficacy against many white grub species

Nematode-infected grubs

S. scarabaeiH. bacteriophora

slide4

Long-term suppression

of white grubs by S. scarabaei

- Field experiments -

  • 4’ x 4’ Kentucky bluegrass plots enclosed by 5” high ‘Emerald Edge’.
  • 160 OB larvae (late L2 & early L3; 10/ft2) released 1 wk before treatment.
  • Application with watering can (~0.5” water) in mid-September (early L3).
  • Field irrigated as necessary to keep out of excessive drought stress.
slide5

Timing of sampling activities

Seasonal

life-

cycle

Annual

White Grub

Appl.

EPN

EPN

EPN

EPN

Grub

EPN

Grub

slide6

Long term suppression

of white

grubs by

S. scarabaei

Expt. 1

Treated 9/17/02

0-2.5 B Ss/ha

slide7

Long-term suppression

of white

grubs by

S. scarabaei

Expt. 2

Treated 9/19/03

0-0.6 B Ss/ha

slide8

Long-term suppression

of A. orientalis in turfgrass

by S. scarabaei

Field experiments (1.5 m2 microplots, 10 L3/0.1 m2)

slide9

Conclusions:

S. scarabaei for white grub control:

  • has outstanding potential as a curative control agent for many white grub species.
  • suppresses grub populations for 1-2 years after application.
  • is effective in a wide variety of soil types.
  • may be a good candidate for inoculative releases.
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