Juniperus. Cedar Apples (Gymnosporangium Spp.)

Large or small red and woody growth at tips of branches. Gelatinous in wet weather.

Control

Prune off affected parts. Keep apples, pears, and hawthorns at a distance.

Kale. Black-Rot

See under Cabbage. Kohlrabi.

Club-Root

See under Cabbage.

Laburnum. Leaf-Spot (Peronospora Cystisi)

Leaves become brown-spotted. Seedlings killed.

Control

Spray with bordeaux mixture.

Contagious Chlorosis

See under Abutilon.

Larix. Canker (Dasyscypha Willkomii)

Canker of trunk and branches, usually around base of trunk.

Control

Eradicate diseased parts, using tree surgery methods.

Laurus. Witches' Broom (Exobasidium Lauri)

Branched out growths, antler-like, 2 or 3 feet in length, springing from the leaves.

Control

Prune off affected parts.

Lemon. Brown-Rot (Pythiacystis Citrophthora)

White mold on surface of fruit.

Control

Not destructive in orchard. Add copper sulfate to water when washing lemons to prevent infection of healthy ones.

Leaf-Diseases

Not well understood. Probably controllable by spraying.

Lespedeza. Mildew (Microsphaera Diffusa)

Powdery mildew of leaves.

Control

Dust with sulfur.

Lettuce. Drop, Or Rot (Sclerotinia Libertiana)

Base of stems or leaves rots off, allowing leaves to drop.

Control

Sterilize soil with steam before planting.

Mildew

See under Cineraria.

Ligustrum. Anthracnose (Gloeosporium Cingulatum)

Affected areas light brown either oblong on one side of the stem or completely girdling it.

Control

Destroy by burning affected plants.

Lilium. Leaf-Spot (Botrytis Sp.)

Orange-brown or buff blotches on leaves, stem and flowers of L. candidum. May be same as Tulipa Mold, which see.

Control

Eradicate diseased plants.

Lily-Of-The-Valley. Stem-Rot

See under Paeonia.

Liriodendron. Twig Blight (Myxosporium Longisporium)

Killing twigs.

Control

Prune off diseased twigs.

Lobelia. Canker (Phoma Devastatrix)

Portions of the stems covered with minute black dots.

Control

Remove diseased plants. They never bloom.

Lonicera. Canker (Nectria Cinnabarina)

Rough canker on limbs covered with flesh-colored or red bodies.

Control

Prune off or cut out all affected parts and cover wounds with tar.

Lupinus

See under Pea.

Lychnis. Smut (Ustilago Violacea)

Pollen-sacs filled with black dust which escapes and discolors the flower.

Control

Destroy the affected plants and use Dew soil.

Lycopersicum

See under Tomato.

Magnolia. Leaf-Spot

See under Grapefruit.

Malva. Rust

See under Hollyhock. Same disease.

Catalogue of Diseases, continued.

Mangifera. Black Blight (Dimerosporium Mangiferum)

Intense black velvety patches on both surfaces of the leaves.

Control

Spray with any good spray mixture. Matthiola.

Club-Root

See under Cabbage.

Mentha. Rust (Puccinia Menthae)

A most destructive rust disease.

Control

None given.

Mignonette. Leaf-Spot (Cercospora Resedae)

First reddish discoloration of leaves. Later small depressed spots with brownish or yellowish margin.

Control

Spraying with bordeaux mixture gives good results.

Morus. Leaf-Spot (Cercospora Moricola)

Not serious.

Leaf-Blight (Pseudomonas Mori)

Wilting and death of leaves. Cankers girdle the twigs.

Control

Prune off diseased parts and burn. Muscari.

Smut ( Urocystis Colchici)

Long black powdery streaks on leaves.

Control

Destroy affected plants by burning. Use new soil.

Mushroom. Mold (Mycogone Perniciosa)

Mushrooms develop abnormally as monstrous soft growths. These develop into a moldy mass and putrify.

Control

Affected beds should be thoroughly cleaned and sprayed with copper sulfate, one pound to fifty gallons of water.

Muskmelon. Downy Mildew. - See Under Cucumber. Wilt

See under Cucurbita.

Narcissus. Leaf-Spot (Ramularia Narcissi)

Spots on leaves and stem.

Control

Burn diseased parts and spray with bordeaux mixture.

Nasturtium. White Rust. (Cystopus Candidus)

See under

Horse-Radish.

Nectarine. Yellows, Etc

See under Peach.

Nerium. Black Mold (Capnodium Faedum)

Black velvety-like growth on leaves.

Control

Spray with bordeaux mixture.

Nicotiana. Root-Rot (Thielavia Basicola)

Blackening and rotting of the roots of seedling plants.

Control

Steam sterilization of seed-beds.

Mosaic Or Calico Disease

Enxymic disease. Mottling of leaf. Spread by touch.

Oak. Anthracnose (Gnomonia Veneta)

Brown spotting on under side of leaves, along veins. Brown pustules on spots.

Death of leaves and twigs. See under Arboriculture, Diseases of Trees.

Control

Collect and burn all diseased twigs and leaves.

Spray with bordeaux mixture frequently from time buds swell.

Cenothera. Leaf-Galls (Synchytrium Fulgens)

Yellow swellings on the leaves.

Control

Destroy affected leaves.

Okra

See under Hibiscus.

Olive. Limb-Gall, Or Knot (Pseudomonas Oleae)

Knots or galls on the twigs and limbs.

Control

Remove and burn affected limbs.

Onion. Mildew (Peronospora Schleideniana)

Causes a wilt or blight of the leaves.

Control

Spray with bordeaux mixture, 5-5-50, to which has been added one gallon of resin sal-soda sticker. First application when third leaf has developed, repeating every ten days until harvest time.