IMPORTANT PECAN INSECTS AND THEIR CONTROL. 



33 



and pecan, it has been reported infesting the California black walnut 1 

 and hybrids derived from this tree. 



About the time the buds on pecan are opening, the eggs of this 

 apln'd begin to hatch. Later the mature insects migrate to the- 

 unfolding foliage, upon which they feed by sucking the juice from 

 the plant. They continue 

 their feeding operations 

 throughout the growing 

 season, or until the trees 

 shed their leaves. 

 Throughout the spring 

 and summer the non- 

 sexual forms give birth to 

 living ^oung, but in the 

 autumn (September and 

 October) the sexual forms 

 make their appearance 

 on the trees and after 

 mating the females deposit 

 eggs on the twigs. These 

 do not hatch until the fol- 

 lowing spring. 



Fortunately this insect 

 does so little damage to 

 pecan foliage that no 

 special remedial measures 

 are required. Its many 

 natural enemies help much 

 in keeping it in check. A 

 significant feature about 

 the infestation by this 

 aphis is the abundance of 

 * honey dew ' ' excreted up- 

 on the foliage. Usually 

 lea\es covered by the sticky excretions support the growth of a black 

 fungus which makes the foliage look unsightly and perhaps interferes 

 to some extent with the proper respiratory action of the plant. 



INSECTS INJURING THE TRUNK AND BRANCHES. 



"WHITE ANTS," OR TERMITES. 2 



Pecan trees, as well as other kinds of plants, occasionally are 

 injured and sometimes killed by attacks of the so-called white 



1 Jvglans californica. 



2 Leucotcrmes flavipcs Kollar is the most widespread and abundant species of termite in the Eastern 

 States. 



FIG. 39. The hickory phylloxera (Phylloxera sp.): Galls 

 on pecan. 



