IMrORTANT PECAN INSECTS AND THEIR CONTROL. 



33 



and pecan, it has been reported infesting the Cahfornia black wahiut ^ 

 and hybrids derived from tliis tree. 



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

 apliid begin to hatch. Later the mature insects migrate to the 

 unfokhng foUage, upon which they feed by sucking the juice from 

 the phmt. 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 young, 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 tliis insect 

 does -so httle damage to 

 pecan f oh age that no 

 special remedial measures 

 are required. Its many 

 natural enemies help much 

 m keeping it in check. A 

 significant feature about 

 ^the infestation by this 

 aphis is the abundance of 

 'honey dew" excreted up- 

 oii the fohage. Usually 

 leases covered by the sticky excretions support the growth of a black 

 fungus wliich makes the foliage look unsightly and perhaps interferes 

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



Fig. 39.— The hickory phylloxera (PAy^oxcra sp.): Galls 

 on iK'can. 



INSECTS INJURING THE TRUNK AND BRANCHES. 



"WHTfE ANTS," OR TERMITES.^ 



Pecan trees, as well as otlicr lands of plants, occasionally are 

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



' Juglans californica. 



- Leucotcrrnes flavipcs Kollar is the most widespread and abundant species of termite in the Eastern 



States. 



