28 MISSOURI AGRICULTURAL EXPERIMENT STATION BULLETIN 176 



types tho pear, cherry, and apple may also suffer from the pest. In the bearing 

 orchard peach does not suffer much injury. 



Peach Twig-borer (Anarsia lineatella}. This small caterpillar is often 

 very injurious to buds and new growth on both nursery and orchard trees. 

 Bearing trees are usually more seriously injured than younger trees. In the 

 summer and fall it is also often quite troublesome, working into the fruit around 

 the stem end or where fruit cracks. Late peaches suffer most. 



It passes the winter as a young larva in a small chamber made in the bark 

 usually at the fork of two small twigs. In the spring these larvae bore into 

 buds and tips of new growth often killing several buds before maturing. These 

 pupate in curled leaves or other protection and the small, dark-gray moth soon 

 emerges to lay eggs for the next generations. . The later generations work 

 more in the fruit and less in the twigs. 



CONTROL. This pest is usually most abundant on neglected trees tho well 

 kept peach orchards may become seriously injured. The best means of reaching 

 the pest is to apply the lime sulphur spray in the spring just as the young 

 larvae are leaving their winter quarters. The spray may be applied, after the 

 buds begin to open but before the blossoms are open, with effective results on 

 the borer and yet not seriously injure the peach foliage. 



SHOT-HOLE BORER. This species has been discussed under the apple insects 

 and the same treatments recommended there will control the pest on peach 

 trees. 



Black Peach Aphis (Aphis persicae-niger). This louse has been re- 

 ported on peach in Missouri but thus far no serious injury has occurred. It 

 works on the roots and in the summer some may come up on the leaves and 

 twigs. It resembles other plant lice in feeding habits by extracting sap. It is a 

 very dark-colored louse. 



CONTROL. If nursery stock becomes infested it should be thoroughly fumi- 

 gated before being disposed of. In the orchard nicotine sulphate sprays are 

 effective where the louse appears above ground and tobacco dust is suggested 

 for the root form where injurious. Thus far this species has not done any 

 appreciable injury in the state. 



The most up-to-date peach orchards of the state usually receive clean cul- 

 ture which materially reduces the favorable conditions for various insects. 

 It is usually the neglected orchard where the above insects are most abundant 

 and injurious. 



INSECT PESTS OF PLUM AND CHERRY 



Plums and cherries are subject to about the same insects as peaches. The 

 San Jose scale attacks certain types of plum and sweet cherries very badly. The 

 plum curculio attacks the fruit of plums and cherries often completely destroy- 

 ing the crop. The peach-tree borer may also do some damage on both plum and 

 cherry. The peach terrapin scale also attacks plum. The plum louse and the 

 cherry louse are also injurious some seasons. The cherry scale often becomes 

 injurious.. The cherry maggot is seldom injurious to cherries in the state as 

 is also true of the apple maggot or railroad worm in apples. Where plum and 

 cherry are attacked by pests discussed under apple and peach insects simply 

 refer to recommendations given under those fruits. 



Rusty Brown Plum Louse (Aphis setoriae}. This dark-brown louse 



