BTK Biological Insecticide 500 ml Concentrate


12 in stock (can be backordered)

Last summer's caterpillar invasion (gypsy moth larvae) left many gardeners desperate for solutions. BTK refers to the active ingredient in this product–Bacillus thuringiensis var. kurstaki. This is NOT a chemical pesticide, but a natural bacteria microorganism. As soon as caterpillars ingest it, they stop feeding and die within days. BTK can be sprayed on all trees– fruit, shade and evergreen as well as vegetable plants. Birds, animals and people are not endangered, but please avoid spraying milkweed plants, as monarch butterfly larvae feed on this plant only. Mix 33 ml per 10 liters water and spray in late afternoon as direct sunlight breaks down the active ingredient.

G41 Dwarf
G935 Small Semi-Dwarf
G969 Small Semi-Dwarf
G30 Semi-Dwarf
G890 Semi-Dwarf
Pollenator definitions
Some trees and many berry plants are SELF-FERTILE ̶means the insect pollinators or even the wind can pollinate the blossoms without the need of a second tree.
NEEDS A POLLENIZER ̶ means another tree of the same type or kind but a different variety must be blooming nearby at the same time.
EXAMPLE A Liberty apple and a Wealthy apple can cross-pollinate. Two trees of the same variety ie: ̶ 2 Wealthy apples, cannot cross pollinate because they are genetically identical.
Other trees are marked as SEMI-FERTILE. These will set fruit without a second tree. However they will often bear more, and sometimes larger fruit if another variety of the same kind of tree is nearby.
You can select 2 different trees of the same kind marked as NEEDS A POLLENIZER or plant one of those along with one SELF-FERTILE or one SEMI-FERTILE. Also consider ripening times ̶ a Goldrush apple might not start blooming before a Pristine is finished.