Bulletin 151, Truck and Garden Insects


 The foregoing dose is twice that of the "horticultural
dose and is about as strong as can be used in a tight room or
box without endangering the germinating power of the seed.
The horticultural dose is that used on nursery stock and is in-
tended to kill insects without injuring the plants.
 Sodium cyanide may be substituted for potassium cyanide
and is much cheaper. Use less of the sodium than of the
potassium salt. To fumigate a room containing 100 cubic feet
of space, pour 2 fluid ounces of water into the jar, and into
this pour 11/2 fluid ounces of sulphuric acid. To complete the
mixture, add 1 ounce of sodium cyanide. Sodium cyanide is
sold in pieces weighing approximately one ounce. This obviates
the necessity of weighing the material.
 ToBAcco.-Tobacco is used as a fumigant in greenhouses
and other closed places. Sheets of tobacco paper" manufac-
tured especially for the purpose, or tobacco stems and refuse
may be used. The material is set on fire and the fumes of nic-
otine given off in the burning kills all tender insects in the
space. Tobacco stems are moistened so that they will smoulder
and smoke but produce no flame.
 NAPHTHALENE.-Naphthalene, the active ingredient of moth
balls, is fairly good as a repellant to keep insects out of stored
grains and seeds but it does not kill them.
 HEAT
 A temperature of from 120 to 130 degrees Fahrenheit, if
maintained for a half hour, is fatal to practically all insect life.
If a bag of seed can be placed in an oven, with a dish of water
to supply moisture, and kept at a temperature of 120 to 130
degrees F. for from 20 to 30 minutes, insects in it will be killed
and the germinating power of the seeds will remain unimpaired.

 GENERAL GARDEN INSECTS AND PESTS
 There is a number of insects that attack practically all
garden crops and could not well be included under only one of
them. They are treated here.
 GRASSHOPPERS
 These insects are particularly annoying on early fall crops.
At that time native vegetation is becoming dry and unattractive
and the grasshoppers, many of which are then in the late
nymphal or the adult stages and consume more vegetation than
the very young, flock to the farmers' crops.