Pictorial supplement to The Fifth Kingdom - Chapter 12

Fungal Plant Pathology

(21 pictures)

blight4.jpg (16612 bytes)

Plant diseases - late blight of potato caused by Phytophthora infestans.

dowmilgr.jpg (6302 bytes)

Plant diseases - downy mildew of grape, caused by Plasmopara viticola.

12-3 Castanea canker.jpg (8549 bytes)

Plant diseases - chestnut blight canker, caused by Cryphonectria parasitica.

12-4 Puccinia graminis.jpg (6559 bytes)

Plant diseases - uredinial stage of wheat rust, caused by Puccinia graminis tritici.

12-5 Southern corn blight.jpg (8447 bytes)

Plant diseases - southern corn blight, caused by Drechslera maydis.

12-6 Dutch elm disease.jpg (8059 bytes)

Plant diseases - Dutch elm disease, caaused by Ophiostoma ulmi, in progress.

12-7 Dutch elm disease2.jpg (5727 bytes)

Plant diseases - Dutch elm disease - the aftermath.

12-8 blue mould of tobacco.jpg (7760 bytes)

Plant diseases - blue mould of tobacco, caused by Peronospora tabacina.

12-9 Monilinia.jpg (5518 bytes)

Plant diseases - Monilinia, a necrotrophic parasite of pears, peaches and apples.

ured3.jpg (6752 bytes)

Plant diseases - wheat rust - vertical section of spermagonial (upper) and aecial (lower) stages of Puccinia graminis in a barberry leaf.

12-11 Venturia.jpg (5997 bytes)

Plant diseases - apple scab -vertical section of Venturia teleomorph in dead apple leaf.

12-12 smut.jpg (5514 bytes)

Plant diseases - smut diseases, such as the corn smut shown here, caused by Ustilago maydis, are usually seed-borne, then become systemic, causing hypertrophy and fruiting only when the next generation of seeds is produced (and therefore stealing the concentrated energy stored by the plant for its own reproduction).

12-13 grey mould.jpg (4397 bytes)

Plant diseases - grey mould, caused by Botrytis cinerea, is a post-harvest disease.

ured7.jpg (7434 bytes)

Plant diseases - how wheat rust ruptures the host epidermis and causes water-loss. Here, in the uredinial stage...

ured9.jpg (3166 bytes)

...and here, in the telial stage.

12-16 anthracnose.jpg (7086 bytes)

Plant diseases - anthracnose, or tissue necrosis, in beans, caused by Colletotrichum.

12-17 Hemileia.jpg (77829 bytes)

Plant diseases - coffee rust - leaf abscission in coffee, caused by Hemileia vastatrix.

clavic18.jpg (5275 bytes)

Plant diseases - choke disease of grasses, caused by Epichloë, prevents the grass from producing seeds.

12-19 haustorium.jpg (7176 bytes)

Plant diseases - penetration of the host plant.

12-20 apple scab1.jpg (6331 bytes)

Plant diseases - apple leaves infected by the Spilocaea anamorph of the apple scab fungus. These infections release many conidia and spread the disease rapidly.

bordmix1.jpg (10189 bytes)

Plant diseases - protecting vines from a pathogen (downy mildew of grape) by spraying with copper-based fungicide (which colours the leaves blue).

As a well-illustrated companion to the forest pathology section of this chapter, I recommend: Allen, E., D. Morrison and G. Wallis 1996. Common Tree Diseases of British Columbia. Available from: Canadian Forest Service, Pacific Forestry Centre, 506 West Burnside Rd., Victoria, BC, Canada.