Si i i i ee 
ON PLANT PATHOLOGY. 
- 
or 
APPENDIX A. 
APPLE. 
Scab. Fusicladium dendriticum 
Brown Rot. Monilia fructigena 
Blossom Wilt. Monilia cinerea . 
Canker. Nectria ditissima . 
Mildew. 
tricha 
DG 2 ae a a 
Silver Leaf. Stereum purpureum 
PEAR. 
Fusicladium pirinum . 
Podosphaera leuco- 
Scab. 
Brown Rot. Monilia fructigena 
PLvuM. 
Silver Leaf. Sterewm purpureum 
Brown Rot. Monilia cinerea 
Rust. Puccinia pruni 
Buack CURRANT. 
Rust. Cronartium ribicola . 
Spot. Gloeosporium ribis 
GOOSEBERRY. 
American Mildew. Sphaero- 
theca mors-uvae 
Die-back. Botrytis cinerea ° 
WHEAT. 
Puccinia glumarum 
Ophiobolus 
Puccinia graminis 
Titletia tritici 
BARLEY. 
Ustilago hordet 
Helminthosporium 
Ophiobolus . 
Oats. 
Rust. Puccinia spp. 
Ustilago avenae 
Ophiobolus . 
CLOVER. 
Sclerotinia trifoliorum .« 
FRUIT. 
LossEs. 
General over England, causing falling of young 
fruit and largely responsible for supplies of 
smal!, poor fruit, which does not keep well. 
Could be controlled by spraying. 
Probably large. 
A serious disease, specially in the 8.E. counties. 
Severely cripples the trees, especially on wet, heavy 
land, and responsible for heavy losses. 
Seriously injures certain varieties in various 
localities. 
Fruit badly damaged in some localities. 
At present not believed to be serious in apples. 
Often very bad, and causing serious losses. 
Could be controlled by spraying. 
? 
Very serious in Victoria and Czar plums. 
Threatens their extinction in some localities. 
Causes much loss of young wood and fruit in some 
localities. 
Causes early defoliation in certain seasons. 
Very bad in many counties in 1917, causing early 
defoliation. 
; 
Formerly very serious in many parts. Much less 
in 1917. 
Serious in many localities. 
CEREALS. 
Sometimes serious. 10 per cent. = 
quarters per annum. 
Locally serious. 
Sporadic. 
In aggregate quite material. 
800,000 
Often serious. 
Often serious. 
9 
LossEs. 
9 
Often serious. 
9 
FODDER. 
Very common locally, and probably largely re- 
sponsible for clover sickness. 
