Guilt by association

Also in this issue:

Hydrilla, a new noxious aquatic weed in California

Vineyard management and nematode populations

Biological control: Pitting insects against insects

Pesticide applications can be reduced by forecasting the occurrence of fireblight bacteria

Walnut varieties differ in susceptibility to codling moth damage

Jojoba wax extraction and bleaching

Controlling powdery mildew in field roses

Beet free periods—the key to higher sugar beet yields

New and redescribed species of Ledermuelleria from North America (Acarina: Stigmaeidae)