SWEET POTATO INSECTS 241 



Infested tubers should not be left in the field. Those only 

 slightly injured may be fed to stock but those more badl}' in- 

 fested should be burned or buried deeply. Care should be 

 taken not to introduce the weevil into uninfested localities by 

 means of infested tubers used for seed. 



References 



Tryon, Queensland Agr. Jour., 7, pp. 176-189. 1900. 

 Tex. Agr. Exp. Sta. Bull. 93. 



Maxwell-Lefroy, Mem. Dept. Agr. India, Ent. Series, 2, pp. 155-159. 

 1910. 



The Sweet Potato Leaf-Roller 



Pilocrocis tripunctata Fabrieius 



A leaf-roller has been reported as occasionally injurious to 

 sweet potatoes in southern Texas. It is a native of the West 

 Indies and occurs sparingly in Louisiana and Florida. The 

 larvae are bluish green in color with the head pale yellow, and 

 when mature are almost an inch in length. The caterpillars 

 feed on the foliage and fold the leaves, thus making a retreat 

 within which the larva lives and within which it spins its cocoon. 

 The pupa is dark brown and about f inch in length. The moth 

 has an expanse of about an inch and is light yellow in color. 

 The front and outer edge of the front wings are grayish brown. 

 There is a nearly straight brown line across the base of the 

 front wing and a wavy line of the same color three quarters 

 the distance from the base on both wings. There are two 

 black spots near the front margin of the front wing and one 

 on the hind wing. There are several generations annually, 

 about twenty-five da}'s being required for the completion of 

 the life cycle. 



This sweet potato pest may be controlled by spraying the 



vines wdth arsenate of lead (paste), 4 pounds in 50 gallons of 



water. 



Reference 



U. S. Dept. Agr. Bull. G09. 1917. 



R 



