MONTANA EXPERIMENT STATION. 249 



A MANUAL OF FRUIT PESTS WITH 



REMEDIES. 



In this manual wc jiurpose to present in condensed and easily 

 accessible form the most essential information regarding the more 

 important insects and fungus diseases that have been recognized in 

 the state or which are liable to appear at any time. It is our in- 

 tention at an early date to prepare another manual similar to this 

 but dealing with farm, garden and lawn pests. 



The reader should freely consult the index in seeking the in- 

 formation he desires. All insecticides .and fungicides recommended 

 are discussed at the end of this section, and formulae for their pre- 

 paration are given. 



Unless the fruit-grower is confident that he knows the pest he 

 16 dealing with he should send examples to the Experiment Station 

 for identification. 



INSECTS INJURIOUS TO THE APPLE. 



I, The Red-humped Apple Tree Caterpillar. 



Bright colored caterpillars with a red hump on the back, feeding 

 on the foliage of apple. Seldom very abundant. 



Remedy. — Remove by hand or spray wnth an arsenical poison. 

 2, Tent Caterpillars. 



Hairy caterpillars with a bright bluish stripe down the middle 

 of the back. Living on wild and cultivated cherry and on apple in 

 the spring of the year. They construct tents or nests in the crotches 

 of limbs from which they venture and feed during the middle of 

 the day. 



Remedy, — Remove the tent by hand, taking care to do so when 

 the caterpillars are home. Under some conditions it is feasible to 

 locate and destroy their eggs during the winter. The eggs appear 

 as thickened bands on small twigs. Individual eggs are cylindrical 

 and in the cluster r.re placed on end, side by side. 



