Previous studies using Silwet L-77 have also shown a high mortality of pests.
Silwet L-77 and horticultural oil thus could be an effective pest management tool, but the need for complete coverage and its short residual activity may restrict its use to plant hobbyists looking for a less-toxic way to control pests.
Silwet L-77 improves the efficacy of horticultural oils for control of Boisduval scale Diaspis boisduvalii (Hemiptera: Diaspididae) and the flat mite Tenuipalpus pacificus (Arachnida: Acari: Tenuipalpidae) on orchids.
Treatments consisted of a water control or Silwet L-77 (99.
Because Silwet L-77 is not labeled for use as a pesticide, it was only used in combination with petroleum oil.
5 and 6 to 5) and 1 was treated with Silwet L-77 (7 to 6.
When petroleum oil at 2% was applied in combination with an adjuvant, only Silwet L-77 significantly increased the mortality of mature nymphs from 44.
However, when Silwet L-77 was added to copper hydroxide at the LLR, mortality increased from 14.
6%, which was significantly lower than the mortality caused by copper hydroxide at the LLR in combination with Silwet L-77 (34.
In order to explore this possibility, laboratory, greenhouse, and field experiments were conducted with Silwet L-77 and another organosilicone adjuvant, Kinetic, alone and in combination with different rates of imidacloprid and abamectin.
Field Trial during Aug 2006 Demonstrating Efficacy of Silwet L-77 as an Insecticide
Ten trees were treated with 500 mL of Silwet L-77 surfactant (99.