NURSERY MANAGEMENT 277 



Winter storage should be at a uniform temperature of 

 28 to 30 degrees. At this temperature little ventilation 

 is necessary, loss of vitality from drying is slight, the 

 tendency to mold is minimized and packing the roots with 

 damp material or spraying with water less. 



372. Spraying nursery stock is as necessary as is spray- 

 ing of fruit trees. Most of the fungous troubles and insect 

 enemies that attack the same kinds of trees in the orchard 

 may be expected, so the same preventives and remedies 

 should be employed. Power sprayers are made specially 

 for nursery work. One of these is shown in Fig. 209. 



373. Fumigation house. For nursery use the fumiga- 

 tion house should be a permanent structure of wood, con- 

 crete or brick, lined with gas-tight material and located 

 some distance from dwelling houses and live stock quar- 

 ters. It should be used for no other purpose, and its 

 gas-holding capacity should be tested at least once every 

 six months. Preferably it should have doors on oppo- 

 site sides, so wagons may be driven in (Fig. 210), fumi- 

 gated without unloading, and hauled out after the opera- 

 tion, thus effecting a saving of work and of time. Pref- 

 erably one of the doors should face the prevailing wind, 

 so the breeze will remove the gas quickly. The doors 

 on the lee side should be opened first, to reduce the rush 

 of gas that would occur in the reverse case. As a further 

 precaution the means of opening should be well to one 

 'side of the door opening, so men will not have to expose 

 themselves to the gas. 



374. Fumigating cions may be the means of preventing 

 insect troubles on nursery stock. An air-tight box, 3 feet 

 long, 2 wide and 2 l / 2 high, contains 12^ cubic feet, for 

 which y% ounce of 98 per cent cyanide of potassium, 3 

 ounces sulphuric acid and 3 ounces water will be suffi- 

 cient for a single charge. The box should be made of 

 heavy and wide matched stuff and be battened at all 

 corners. Every crack must be plugged tight with white 

 lead. The lid, which should have at least two cleats in- 



