SPRAYS AND OTHER MEANS OF CONTROL 



1871 



Brau-riiris Ureeii Miisli 



raris green 1 lb. 



Bran 40 lbs. 



Molasses or sugar 1 to 2 lbs. 



Salt ^ lb. 



Make a mash by adding water; add 

 molasses (or sugar) and salt; mix 

 thoroughly and scatter in small piles 

 among plants or in beds before planting. 

 This bait will prove more or less effective 

 in killing cutworms and cabbage worms. 

 It may be sown among the rows of plants 

 to be protected. It is valuable for de- 

 stroying cutworms in young onions. 



Criddle Mixture 



Though this mixture is somewhat dis- 

 agreeable to make and handle, it is ex- 

 ceedingly cheap and effective, especially 

 for grasshoppers. 



Fresh horse dung GO lbs. 



Common salt 2 lbs. 



Paris green lib. 



The Paris green is mixed with enough 

 water to form a paste and is then stirred 

 thoroughly into the horse dung with the 

 salt. 



These poisoned baits are scattered about 

 in fields infested with grasshoppers, army 

 and cutworms and various other destruc- 

 tive chewing insects, or they may be 

 placed in advance of the oncoming hordes. 

 A very important thing in handling the 

 poisoned baits is to see that they are kept 

 moistened all the time, as they become 

 worthless when dry. To prevent this dry- 

 ing out the mixture should be put out in 

 small piles and occasionally moistened. 

 They may also be placed under boards or 

 in the shade, while for cutworms and 

 wireworms it is often advisable to bury 

 them in the ground. 



♦FIMIGATION 



Fumigation consists in the generation 

 and uses of gases to kill destructive in- 



* For further Information relative to fumiga- 

 tion, see 



Bulletin No. 76. Bureau Entomolocr. TJ. S. 

 Department Agriculture, b.y A. W. Morrill. 



Bulletin No. 70, Bureau of Entomology. U. S. 

 Department Agriculture, by R. S. Woglum. 



Bulletin No. 00. (Part I.) Bureau of En- 

 tomology, TI. S. Department of Agriculture, by 

 n. R. Woglum. 



Bulletin No. 00. rPart II.) Bureau of En- 

 tomology. IT. S. Department of Agriculture, by 

 R. S. Woglum. 



Bulletin No. 1.52. California Agriculture Ex- 

 periment .Station, by C. W. Woorlworth. 



Circular No. 11. California Agriculture Ex- 

 periment Station, by C. W. Woodworth. 



Circular No. ."iO. California Agriculture Ex- 

 periment Station, by C. W. Woodworth. 



sect pests. Formerly such practices were 

 limited to the uses of carbon bisulfid, sul- 

 phur dioxid and tobacco fumes. The use 

 of hydrocyanic acid gas in citrus orchards 

 has lately been so perfected as to become 

 of very great importance, and has opened 

 up a remarkable field in the control of or- 

 chard pests. 



Carbon Bisulfid 



Carbon bisulfid is a liquid which evap- 

 orates into a heavy, highly explosive gas. 

 It was first used for fumigating beans, 

 grains or cereals for weevils, and is still 

 a very efficient method of controlling such 

 pests. In handling the liquid great care 

 should be taken to keep it away from 

 a flame on account of its being highly 

 explosive. 



For Storehouse Pests 



Before fumigation is begun care should 

 be taken to see that the room or contain- 

 er is made as tight as possible. The 

 temperature should be 70 degrees Fahren- 

 heit, or above, as poor and unsatisfactory 

 results are sure to follow even excessive 

 doses at a lower temperature. In a tight 

 compartment five pounds to every 1,000 

 cubic feet gives excellent results in kill- 

 ing weevils. If the compartments cannot 

 be made tight, increase the amount of car- 

 bon bisulfid. 



For Root Pests 



In the field this liquid is used to kill 

 root pests, as woolly aphis, black peach 

 aphis, phylloxera, grubs, maggots, etc., 

 but is practical only in sandy or porous 

 soils. For a small plant a single hole 

 is made near the base and a teaspoonful 

 of the liquid poured in and the hole cov- 

 ered to prevent outside evaporation. For 

 larger plants several or many holes 

 should be made, deep enough to allow 

 the liquid to evaporate around the in- 

 fe.sted roots. A syringe-like instrument 

 is sometimes used to inject the liquid 

 around the roots. 



For Borers 



Injections of carbon bisulfid into the 

 burrows of wood borers and stopping the 

 entrance of the burrows will kill all the 

 insects reached by the gas. 



