STORED GRAIN INSECTS 



131 



will settle down through the grain and kill the in- 

 sects ; do not go near the boxes with a light of any 

 kind until the covers have been removed and the 

 boxes thoroughly aired. 



In general, where bins or granaries are actually 

 air-tight or nearly so, from 3 to 5 pounds of carbon 

 bisulphide to 1000 cubic feet of space should be suf- 

 ficient. Under ordinary circumstances from 15 to 

 20 pounds per 1000 cubic feet are necessary owing 

 to the cracks and openings.^ Best results will be 

 obtained when the temperature is above 75° F. 



Within the last few years heat * has been used to 

 exterminate stored grain insects, especially in flour 

 mills. The radiation surface is increased until a 

 temperature of 118° to 125° F. can be maintained 

 for several hours. 



A very simple method of preventing injury to 

 peas and beans is by the use of air-slaked lime.'' 

 For small quantities use four parts of lime to one 

 part of seeds; for quantities from a peck to three 

 bushels use equal amounts of lime and seeds; for 

 larger amounts use one part by weight of lime and 

 two parts of seeds. The seeds and lime should be 

 mixed somewhat when ready for storage. 



INSECTS INJURIOUS TO GREENHOUSE PLANTS 



The greenhouse leaf-tier ^ (Phlycfaenia 



ferrugalis) 



Order — Lepidoptera 



The parent insect is a rusty-brown moth that lays 

 its flat eggs in groups of 2 to 12 on the undersides 

 of the leaves of greenhouse plants ; they hatch in 10 

 to 12 days; the caterpillars are pale greenish-white 



3 Hinds— U. S. Dept. Agr., Par's' Bull. 799. 



4 Dean— Kan. Expt. Stat., Bull. 189. 



5 Metcalf— Jr. Ec. Ent., Vol. X, p. 97. 



