DUST SPRAYING VERSUS LIQUID SPRAYING 47 





potato vines from attacks of flea beetles. It drives striped cucum- 

 ber beetles away from melons and cucumbers. 



Road dust is used effectively against slugs on foliage. 



Crude Carbolic Acid. Dissolve one pound of hard soap 1 in 

 one gallon of water by boiling, add one pint of crude carbolic acid 

 and churn by forcing it with a spray pump over into itself until 

 emulsion is formed. The stock solution should be diluted with 

 about thirty parts of water when wanted for use. It is employed 

 against root maggots, but the arsenite of soda spray appears to be 

 more effective and easier to prepare. Diluted one part of stock 

 carbolic solution to twenty parts of water, it is used in California, 

 as a spray against mealy bugs, plant lice and soft brown scale. 



Fio. 67. A hand dust sprayer at work in a nursery. 



Hot Water. Boiling hot water, poured upon plants from a 

 watering pot held above the plants, has sufficient heat to kill 

 caterpillars (green cabbage worms, for example) without injuring 

 the foliage. 



Dust Spraying Versus Liquid Spraying. This subject is one of 

 some controversy between workers, with most of the evidence in 

 favor of the latter process. However, where water is scarce, or 

 when orchard trees or other crops are on steep hillsides where liquid 

 cannot well be hauled, the dust spray appeals to one strongly. 



1 Wherever hard soap is mentioned in the above suggestions it can be 

 replaced with soft soap by using twice as much of the soft soap as directed 

 for the hard soap. 



