Insect Control Application Guide
Dendrex
Application Instructions
When to Apply: When plant root systems are established and actively growing. Apply at the first evidence of insect activity to maximize control potential.
Spacing: See the chart below for spacing details specific to each treatment.
Timing: Refer to the chart below for timing guidance per insect species.
| Plant | Insects | Microinjection Unit Spacing Interval Around Stem Circumference | Time of Injection |
|---|---|---|---|
| Trees and Shrubs (No Crabapple) see below |
Aphids, Bagworms, Birch leaf miner, Tent caterpillar, Lace bugs | 1 microinjection unit every 6 inches | As the insects begin to appear. |
| Trees and Shrubs (No Crabapple) see below |
Tussock moth larvae, Gypsy moth larvae | 1 microinjection unit every 6 inches | As the insects begin to appear. |
| Trees and Shrubs (No Crabapple) see below |
Scales (crawlers) | 1 microinjection unit every 6 inches | As crawlers begin to appear. Repeat every 4+ weeks if necessary due to ongoing hatching. |
| Trees and Shrubs (No Crabapple) see below |
Grasshoppers | 1 microinjection unit every 6 inches | As the grasshoppers begin to appear. |
| Trees and Shrubs (No Crabapple) see below |
California oak worm | 1 microinjection unit every 6 inches | As the insects begin to appear. Use higher amount for large larvae. |
| Trees and Shrubs (No Crabapple) see below |
Cankerworms, Nantucket pine tip moth larvae, Zimmermann pine moths | 1 microinjection unit every 6 inches | Timing is critical. Consult local extension. Repeat for new generations. |
| Trees and Shrubs (No Crabapple) see below |
Root weevil adults | 1 microinjection unit every 6 inches | Apply when first damage appears. Repeat every 4 weeks until frost if needed. |
| Trees and Shrubs (No Crabapple) see below |
Box elder bugs, Thrips, White flies, Sawflies, Budworms, Cone worms, Casebearer, Webworms, Leaf miners, Pine needle miner | 1 microinjection unit every 6 inches | As insects appear. |
| Trees and Shrubs (No Crabapple) see below |
Bronze birch borer | 1 microinjection unit every 6 inches | Mid-July through August |
| Trees and Shrubs (No Crabapple) see below |
Japanese beetle | 1 microinjection unit every 4 inches | As beetles appear. Repeat every 4 weeks as needed. |
| Trees and Shrubs (No Crabapple) see below |
Elm leaf beetle (larvae) | 1 microinjection unit every 4 inches | As larvae appear. Will not stop egg hatch. |
| Flowering crabapples | Aphids, Tent caterpillars, Leaf rollers | 1 microinjection unit every 6 inches | As insects appear. |
Caution: Phytotoxicity has occurred on the following crabapple varieties: ‘Hopa’, ‘Ichonoski’, ‘Malus floribunda’, ‘Pink Perfection’, ‘Red Wine’, and ‘Snow Cloud’.