| Redheaded Ash Borer |
Spray trunks and large branches with lindane 20% EC or chlorpyrifos (Dursban 2E). Apply the first spray in late April and respray every three to four weeks until early August. It is not necessary to spray small branches and leaves. |
| Cottonwood Borer |
Spray lower trunk with lindane 20% EC in late May and late June. Borers inside trees may sometimes be killed by injecting special borer control pastes containing malathion or lindane into burrow openings where frass is evident. |
| Poplar Borer |
Spray lower trunk of cottonwood trees with lindane 20% EC in late May and again in late June. |
| Bronze Birch Borer |
Spray entire tree with lindane 20% EC in late May and repeat in two to three weeks. |
| Lilac and Privet Borers |
Spray with lindane 20% EC or chlorpyrifos (Dursban 2E) in early May and repeat twice in mid-May and early June. Wet lower portions of stems to point of run-off. Borers inside canes sometimes may be killed by injecting special borer pastes containing malathion or lindane, by plugging the openings, or by probing the openings with a stiff wire. |
| Ash Borer |
Spray lower trunks with lindane 20% EC or chlorpyrifos (Dursban 2E), with the first application in early August and the second in early September. It is unnecessary to spray branches and leaves. Borers inside trees may sometimes be killed by injecting special borer pastes containing malathion or lindane, by plugging the openings, or by probing the openings with a stiff wire. |
| Carpenter worm |
Spray the lower ten feet of trunk with lindane 20% EC in late May and late June. Borers inside trees may sometimes be killed by injecting special borer pastes containing malathion or lindane, by plugging the openings, or by probing the openings with a stiff wire. |
