Plant Diseases 331 
turn produces the branches with thin-walled spores, and 
so on. 
Now it is obvious to all that the proper thing to do 
is to take off the infected leaves immediately the spots 
appear, and burn them, or if the plants are badly affected, 
they should be pulled up entirely and burned to prevent 
its spreading. Onions should not be planted on the same 
ground the following season, and those grown in the same 
garden during that season should be dusted with a fine 
dusting of 2 parts of lime to i part of sulphur two or three 
times during the season to prevent any possible attack of 
the disease. 
PEA-SEEDLING BLIGHT 
The seedling Peas are sometimes attacked by a curious- 
looking disease. The young plants become yellowish or 
blackish in colour, and very soon die away altogether. 
This disease — like many others— is worse in wet seasons 
having warm and cold spells. The diseased plants are 
almost covered with little fruiting branches which bear 
a three-septate spore at their apex; these are blown 
about or carried by insects, and germinate, thus starting 
the disease on fresh young seedlings near. 
The seed should never be sown too thickly, or the 
plants will be weak from overcrowding, and also from 
the want of sufficient food, and therefore an easy prey 
to the attack of the disease. The disease spreads most 
rapidly when the seedlings are crowded. 
Spraying with a weak solution of Bordeaux mixture 
will be effective in preventing its spread and checking 
its progress. 
