21 



burning any badly infested flush out of season ; — all these are 

 likely to keep bollworm injury at a minimum. 



The boll- worm is to some extent parasitized by hymenop- 

 terous flies. The writer has bred Clielonus blackburni from it 

 and others are reported. It is also parasitized in India. How 

 effective parasites may be in reducing the ravages of the boll- 

 worm is only a matter for conjecture, but the introduction of 

 effective parasites would be highly desirable. 



The cotton bollworm of the Southern States, Heliothis obso- 

 leta, has not as yet been found to attack cotton here. It often 

 infests corn and has occasionally been bred from other plants. 

 Its parasites are so efficient that it is not expected it will 

 become an important factor in our cotton production. 



A leaf-folding caterpillar (larva of Archips postvittanus Wkr. 



erpillar measures about an inch in length and is more or less 

 slender. The chrysalis is naked, slender and dark brown. 

 The adult moth has a wing-expanse slightly over one-half inch. 

 The wings are pale brown with darker markings. It is not of 

 sufficient importance to demand especial attention. 



The larva of the Phycitid Crypioblabes aliena has also been 

 found on cotton, but it probably does not feed on the plant, 

 rather on the remains of insects. It is found in mussy places 

 on the leaves and bolls. The full-grown caterpillar is naked, 



LEAF-FOLDING CATERPILLAR. 



Pig. 13 — Leaf-feeding: caterpillars, a, Archips postvittanus 

 Wkr. b, Cryptoblabes aliena Swczey, ms- sp., on cotton. 

 (Photograph by author.) 



Tortricidae) af- 

 fects cotton and 

 does some, al- 

 though more or 

 less slight, injury 

 to the foliage. The 

 caterpillar is nak- 

 ed and dark green, 

 the shield light 

 colored, slight- 

 ly brownish. When 

 full-grown the cat- 



