How do you control needle blight?

How do you control needle blight?

Manage this disease by maintaining good air circulation, mulching and preventing sprinklers from spraying needles. Austrian pine and Ponderosa pine are most likely to be damaged by this disease. Red pine and Scots pine are mostly resistant. Fungicides can be used to protect trees from Dothistroma needle blight.

How is Lophodermium treated?

Chemical

1. Apply an appropriate fungicide three to four times beginning in July and continuing at three-week intervals.
2. Apply the fungicide during periods of low air movement and when material will have adequate time to dry on needles.

When should you spray for needle cast?

Fungicides

• Make one application in spring or early summer when the new needles have grown to half their mature length.
• Make a second application 3 to 4 weeks later.
• Chlorothalonil based fungicides may discolor spruce needles. As a result some chlorothalonil-based fungicides are listed as phytotoxic to spruce trees.

What causes pine blight?

Dothistroma needle blight is caused by the fungus Mycosphaerella pini Rostr. This common pine pathogen kills needles of all ages and can weaken or kill Austrian pine trees.

When do you spray fungicide on pine trees?

Professional fungicide sprays can also control the fungus. The Michigan State University Extension recommends applying fungicide when new needles are about half-grown between May and June and to apply a second spray three weeks later. Seasons: Symptoms appear in the early fall.

How do you treat Dothistroma needle blight?

Dothistroma needle blight can be controlled, but not cured, with sprays of fungicide. As with any needle blight disease, the aim of spraying the tree is to break the annual cycle of infection in the new needles. Multiple seasons of treatment are needed before results are noticeable in the tree.

How do you control a cast needle?

Begin needlecast treatments in spring when new needles are 1/2–2 inches long. In the Northeast and Northcentral states, start spraying for Lophodermium needlecast in mid-July and early August. Once treatments begin, reapply Daconil® fungicide every three to four weeks until dry weather stabilizes.

What is the best fungicide for evergreen trees?

We use propiconazole or thiophanate methyl or a combination of the two. Fungicide injections using propiconazole can also give good control. Infected needles and leaves are the main source for re-infection of the new plant foliage.

How do you treat pine tree fungus?

Do not plant young, healthy two- and three-needled pines near older, infected pines. Remove infected twigs to reduce the amount of fungus in the tree. Apply a fungicide beginning as the buds swell in the spring and repeat application until the needles reach full size. Spraying at other times is not effective.

How do you get rid of pine tree fungus?

What do you spray on pine trees for fungus?

Dothistroma is treated with copper fungicides (Junction or Kocide or CuPRO). As far as we are aware, no other fungicides are labelled for Dothistroma in pines. Diplodia is treated with sprayed systemic fungicides like thiophanate methyl (Clearys 3336, others) and/or propiconazole (Bannermaxx, others).

When to look for a Lophodermium needle cast?

Raised, black, football-shaped fruiting bodies appear on dead needles still attached to the tree and those on the ground The most accurate and easiest identification period for Lophodermium needle cast is in mid- to late summer when the fruiting bodies are present on needles infected the previous year.

When does Lophodermium spread from tree to ground?

Biology and Life Cycle. This often occurs during cool rain events in late summer and fall. Since most of the infection comes from needles already on the ground, poor air circulation under the tree is a major contributor to the spread of the disease. The infection from needles already cast from the tree is unique to Lophodermium.

When is the best time to cast Lophodermium?

The most accurate and easiest identification period for Lophodermium needle cast is in mid- to late summer when the fruiting bodies are present on needles infected the previous year. The shiny, black, football-shaped fruiting bodies are 1⁄32 inch (0.8 mm) long.