6 



BULLETIN 52, U. S. DEPARTMENT OF AGEICULTURE. 



fungous infection was decidedly beneficial. This must not be taken as 

 showing that spraymg made the fruit set better, for such was not the 

 case. The fruit set equally well on the unsprayed trees, but the dis- 

 eased panicles were not able to carry it to maturity. 



Of the 136 sprayed fruits harvested, 74 per cent were bright and 

 clean, 20 per cent slightly diseased, and 6 per cent badly diseased. 

 Only 14 fruits weie harvested from the unsprayed trees. Of these, 

 2, or 14 per cent, were slightly marked by the fungus and 12, or 86 

 per cent, badly diseased. 



THE EXPERIMENT ON THE ROOP FARM. 



Two seedling trees were used in the experiment on the Roop farm, 

 both of which bloomed heavily. One was sprayed according to the 

 plan used in block 1 of the Flanders experiment. They had both 

 bloomed in January, and at the time of the beginnmg of the second 

 bloom a number of diseased peduncles were still on the trees. (PI. 

 Ill, figs. 1 and 2.) No fruit was set from this January bloom. The 

 dates of spraying are given in Table III. 



Table III.- 



-Spraying schedule followed on the seedling mango on the Roop place, Miami, 

 Fla., 1912. 





Febru- 

 ary. 



March. 



April. 



May. 



June. 



Dates of spraying ' .... 



29 



2,5,8,11,14 



1,22 



13 



3 







The last spraying, which should have been given on June 24, was 

 omitted because the few fruits which remained on the tree were so 

 badly diseased that it was not thought worth while to spray again. 

 The fruit counts were made on June 29 and were as follows : 



Table IV. — Fruit counts of the seedling mangos in the spraying experiment on the Roop 



place, Miami, Fla., 1912. 



Tree. 



No. 1 (sprayed) 



No. 2 (unsprayed) . 



Condition of the fruit. 



Clean. 



Slightly 

 diseased. 



Badly 

 diseased. 



Only one fruit was set on the unsprayed and only 54 on the 

 spray(;d tree. The panicles on the sprayed tree showed no sign of 

 disease up to the time of blooming. Most of the blossoms became 

 infected, however, as they opened. The pedicels showed disease 

 as far back as the flowers extended about a week after blooming. 

 These were covered with Bordeaux mixture practically all of the 

 time, but the disease spots developed beneath the covering of the 



