small trees, and the insects spoiling them destroyed by means 

 of the gas generated inside the tent. Smoke from ignited 

 mahua seed oil-cake at the first appearance of an insect-pest 

 has been found efficacious. One and a half maunds of this 

 cake per acre burnt wind-ward are quite sufficient. The 

 generation of Chlorine gas wind-ward has been also found 

 efficacious in scaring away locusts, grass-hoppers and hispas. 

 Common salt (375 parts), black oxide of manganese (150 

 parts) and sulphuric acid (300 parts), are used for the gener- 

 ation of this gas. The above quantities of salt and 

 black oxide of manganese are shaken up with 300 parts of 

 water and then the sulphuric acid is poured on the mixture, 

 slowly from one side. 



1.155. For scale-insects, resin-wash is particularly useful. 

 It is made by boiling together for 3 hours in a covered vessel 

 5 Ibs. of caustic soda, 15 Ibs. of resin, and sufficient water. 

 Then the mixture is diluted with water by gradually bringing 

 it up to 100 gallons. It is then to be strained through canvas, 

 and when quite cool applied with an Eclair Vaporiser. For 

 scale-insects the best remedy is the lady-bird which feeds on 

 them. 



1.156. As an insecticidal paint for the trunk and main 

 branches of trees that are spoilt by insects (mainly scale-in- 

 sects), the following is recommended. Boil 2 Ibs. of sulphur 

 and i Ib. of stone-lime in 2 gallons of water for ij hours. Then 

 add 3 Ibs. more of stone-lime and boil for another \ hour. 

 Make up with boiling water to 2 gallons and add enough 

 fine flour or fine clay to the mixture to make it like thin 

 paint. 



1.157. F r Aphides squirting or spraying of a solution of 

 soft soap mixed with some bitter substance such as a decoc- 

 tion of catechu or of quassia, answers very well. But the 

 Calcium Sulphide wash is the best for aphides. It is prepar- 

 ed in this way. Unslaked lime 18 seers, Sulphur 9 seers, 

 and^Salt 6| seers are to be mixed up in the following manner. 



