CHRYSANTHEMUM MIDGE. 17 



divided into three divisions or rows, namely, (a), (b), and (c). The 

 last, (c), in each case served as a check on (a) and (b), which were the 

 treated rows. The first treatment consisted of dipping the cuttings 

 directly after they were taken, and the subsequent treatments con- 

 sisted in spraying daily for a period of 7 days thereafter with a solu- 

 tion of the same strength. 



Lot 1 consisting of clean cuttings to be used as a check was kept in 

 a separate and uninfested unit for the purpose of determining the 

 effect of such treatment on the cuttings. Lot 2 consisting of clean 

 cuttings and lot 3 of infested cuttings were both tightly screened and 

 placed in a propagating frame in an infested unit. In this manner it 

 was hoped to determine the effectiveness of such treatment when 

 both clean and infested cuttings had to be grown together. 



LOT 1. 



Six clean cuttings in each row. 



Row (a). Nicotine sulphate (1-800) plus fish-oil soap 1 ounce to 1 gallon of 

 solution. 



Row (b). Volatile nicotine sulphate (1-800) plus fish-oil soap 1 ounce to 1 gal- 

 lon of solution. 



Row (c). Checks; not treated. 



Results. — During the period of treatment it appeared as though all 

 the plants were affected slightly. Row (a) : The lower leaves of all 

 the cuttings turned yellow, but 10 days after treatment was discon- 

 tinued all but one cutting were in fine condition. Row (b) : Even 

 though no direct signs of burning were evident, the plants appeared 

 sickly during the second and third treatments. Ten days after the 

 discontinuance of the treatments the cuttings were in better condi- 

 tion than either (a) or (c). The check row (c) was slightly affected 

 due to its proximity to the treated rows. Ten days after treat- 

 ment was stopped only two plants were in good condition and one 

 was poor. 



The conclusion to be drawn from this test is that the method of 

 treatment under (b) was probably the better of the two. 



LOT 2. 



Seven clean cuttings in each row. Placed in infested unit after 

 first treatment. 



Row (a). Nicotine sulphate 40 per cent (1-1,000) plus fish-oil soap 1 ounce to 



1 gallon of solution. 

 Row (b). Volatile nicotine sulphate 40 per cent (1-1,000) plus fish-oil soap 



1 ounce to 1 gallon of solution. 

 Row (c). Checks; no treatment. 



Results. — Although this dosage was weaker than that used in lot 1, 

 it affected the cuttings much more. After the second and third 

 treatments the plants all looked wilted. Ten days after the last 



