Billeder på siden
PDF
ePub

PREFACE.

IN looking back over the past ten or twelve years, it is difficult to realize the rapid advance made in combating the insects and fungi which attack our cultivated plants. It is not going too far to say that the discoveries made within this period have worked almost a revolution in certain lines of agriculture. So phenomenal has been the progress in this direction that we are sometimes led to think that we have gone forward too fast, for in our intense desire to make the work thoroughly practical we have in many cases merely skimmed the surface, overlooking some of the most important fundamental questions involved. However this may be, the fact remains that America to-day stands well to the front in the discovery and application of practical methods of dealing with the numerous insect and fungous enemies of cultivated plants. The advance in this department has been so rapid that it has hardly been possible for investigators to keep track of all that has been written on the subject, nor has it, under the circumstances, been an easy matter to pause and consider what is to be the final outcome of work of this kind. This seems to be a fitting time, therefore, to take a broad survey of the subject in order that we may see where we stand. Mr. Lodeman has done this in the present volume, in which is given a clear, concise statement of the existing condition of our knowledge on

the spraying of plants and the fundamental principles underlying this operation.

As to the future, it can only be said that the prospect for broadening the work so well begun is exceedingly promising. As yet it cannot be stated that we have a well-defined science of plant pathology, but gradually the investigations and thought in this direction are being crystallized. It is now realized that to truly understand and appreciate pathological phenomena we must be familiar with physiology, the normal life processes of plants. After all, the highest aim of the investigator in this field of research is not to deal only with effects as he finds them, but to study causes, as it is only by this means that the true nature of many of the phenomena involved can be obtained. Following this line, we shall in the future look for a science capable of elucidating the problems which form the very basis of agricultural and horticultural pursuits.

WASHINGTON, D.C.

B. T. GALLOWAY.

[ocr errors]

-

cus

Melons Scale Insects-Apple-tree Borer — Slugs - Cater-
pillars - Bed-bugs - Brown Turtle Insect - White Scaly Coc-
Pine-bug Peach Mildew-Woolly Aphis Aphis-
Thrips Wood-lice Insects on Fruit Trees - Currant Worm
- Rose-bug Mildew on Chrysanthemum, Grape, Gooseberry
- Curculio-Rose Mildew.

―――

Pages 1-18

-

[ocr errors]
[ocr errors]
[ocr errors]

-

-

CHAPTER II.

SPRAYING IN FOREIGN COUNTRIES.

IN FRANCE.


-

Discursive Trials of Fungicides (page 19). Acetate of Potassium
- Sulphur-Downy Mildew of the Grape in France - Powdery
Mildew of Grape Powders Iron Sulphate - Plaster-
Fungivore Pear Diseases Sulphuric Acid Copper Sul-
phate-Spores affected by Copper Sulphate-Treatment of
Grape Anthracnose Copper Sulphate upon Posts, Tying
Materials, and Stocks - Phenic Acid Emulsion.
Origin of the Bordeaux Mixture (page 24). — An Accidental Dis-
covery Early Experiments in its Use-Downy Mildew first
systematically treated with Bordeaux Mixture - Other Mate-
rials tested-First Published Formula for the Bordeaux Mix-
ture - Tomatoes sprayed with Bordeaux Mixture for Rot-
Recommendations for Treating Potatoes - Treatment of Beaune
- Treatment of Millardet Spraying with Simple Solution of
Copper Sulphate - Spraying with Milk of Lime - Treatments


-

with Powders.

[ocr errors]
[ocr errors]

-

-

[ocr errors]
[ocr errors]

-

[ocr errors]

Origin of the Ammoniated Copper Fungicides and Various Com-
binations (page 30). The Use of Eau Céleste A Dilute
Bordeaux Mixture Bouillies Bourguignonnes.

Powders (page 32). — Podechard's - David's - Sulphosteatite-

-

Sulfatine.

Perfection of Fungicides (page 34). Stock Solutions for the
Bordeaux Mixture - Treatment of A. Bouchard - Modified Eau
Céleste Bouillie Berrichonne - Treatments for Anthracnose of
Grapes-Tests of Fungicides - Grape Black Rot in France -
Bordeaux Mixture containing some Dissolved Copper - Bor-

―――――

« ForrigeFortsæt »