TWENTY-FOURTH EEPOKT 01' STATE ENTOMOLOGIST 15 



for the low honey flow in these years. Beekeepers observed that 

 after light showers which brought out the moths in millions, there 

 was a reduction in tlie amount of honey produced. 



FRUIT INSECTS 



The Codling Moth {Carpocapsa pomonella L.). In the Hamil- 

 ton section of the Bitter Root Valley apple orchards which have been 

 unsprayed for one to three years show from 2 to 15 per cent codling 

 moth infestation. In a few orchards the percentage runs even higher. 

 In the Missoula district the unsprayed orchards show from 40 to 

 50 per cent infestation. In either of these districts one lead arsenate 

 spray was sufficient in many cases to reduce the infestation to 1 per 

 cent. In cases where both the calyx and first cover sprays were 

 applied the damage from codling moth was negligible. 



The Oystershell Scale (Lepidosaplies ulmi L.). On account 

 of less spraying being done the last two or three years, the oyster- 

 shell scale has increased to a point where 1 to 4 per cent of the fruit 

 was infested. 



Woolly Aphis {Eriosoma laniyera liausm.). This insec^t is very 

 bad in the central part of the Bitter Root VaUcy around Hamilton, 

 Victor, and Stevensville. Associated with it in a few orchards is the 

 disease known as perennial canker. Tlie spread of this disease nov. 

 makes the control of woolly aphis very nnich more imjiortant than 

 formerly. Advantage is being taken of the Oregon method \)\ which 

 the aphis is destroyed with tobacco extract sprays, cankered tissue 

 cut out, and the new wood protected by a special paint. 



Green Apple Aphis (Apliis mali DeG. ). Very general distribu- 

 tion of the green apple aphis occurred in 1932 and heavy infestations 

 were common on the younger trees. 



Wasps (Vespidae). Several species of wasps oi- yelUnv jackets 

 caused an important loss to tlie eliei-i-y erop 1>> rating tlu- jjartially 

 ripened fruit. Some trouble fioni these inseets was experienced in 

 the Bitter Root Valley but il was in the l^Mathead cherry districts 

 that they became a major j'est. It lias been noted in the past thai 

 wasps become enormously aluindant dui-ing twn (ir tiirec years and 

 then suddenly drop to insignificant numljers. This will doubtless 

 happen in this instance but a reliable control method is vci-> much 

 needed The Montana Agricultural Experiment Station will make 

 an effort to solve the problem during the coming .season. 



