14 BULLETIN 113, U. S. DEPARTMENT OF AGRICULTURE. 



ceived an application of lime-sulphur solution at the rate of \\ gal- 

 lons to 50 gallons of water when the cluster buds opened, chiefly for 

 the purpose of controlling apple scab. Plat V received two applica- 

 tions of arsenate of lead at the rate of 2 pounds to 50 gallons of water 

 when the buds were swelling and when the cluster buds opened. The 

 results on this plat were satisfactory, being practically the same as 

 where the dormant application of lime-sulphur solution was used. 



More than 50 per cent of the fruit buds on the unspra}<ed trees 

 were infested with the larva?, and the trees set less than half a crop 

 of fruit. 



Observations were made throughout the vicinity of Benton Harbor, 

 Mich., to determine the extent of infestation of the lesser bud moth. It 

 was noted that practically all unsprayed apple and peach orchards 

 were badly infested, while all apple orchards which were thoroughly 

 sprayed for the San Jose scale in the dormant state and followed up 

 by later sprayings were free from infestation. No apple orchards 

 were found which received only the dormant application, so that 

 the effect of this one spraying could not be determined. However, 

 the peach orchards in this section are sprayed with lime-sulphur late 

 in the spring, just before the buds open, for control of the San Jose 

 scale and leaf-curl, and in only a few cases do they receive any other 

 application of spray. In these orchards, which receive only the 

 dormant application of the lime-sulphur solution, the lesser bud- 

 moth is thoroughly controlled, while unsprayed peach orchards are 

 moderately to badly infested. 



RECOMMENDATIONS FOR CONTROL. 



The foregoing experiments, as well as general observations made 

 throughout the infested section at Benton Harbor, Mich., show that 

 the lesser bud-moth can be controlled by thoroughly spraying the 

 trees in the dormant state with lime-sulphur solution at 32° Baume 

 used at the rate of 1 gallon to 8 gallons of water. Lower testing 

 material should be used at increased strengths. The spraying should 

 be done just before the buds swell, or preferably when the buds are 

 swelling. This treatment is especially to be recommended, as it 

 involves no extra application where it is necessary to spray during 

 the dormant season for other insects, such as the San Jose scale, 

 oyster-shell scale, scurfy scale, and blister-mite, and for the peach 

 leaf -curl. 



In cases where it is not expedient to use the lime-sulphur solution 

 two early applications of arsenate of lead at the rate of 2 pounds to 

 50 gallons of water should be made. This should be applied first when 

 the buds are swelling and again when the cluster buds open. This 

 latter application coincides with the first apple-scab treatment. In 



