82 



INSECT ENEMIES OF THE BOLL WEEVIL. 



Plant. 



Infested by — 



Galpinsia hartwegi 



Auleutes tenuipes Lee. 

 Arxcerus fasciculatus DeG. 

 Brachytarsus alternatus Say. 

 Trichobaris trinotata Say. 

 Trichobaris trinotata 



Ipomosa lacuno^a 



Ipomcea pandurata 



Physalis heterophylla. 



Physalis lanccolata . . 



Physalis longifolia 



Trichobaris trinotata. 



Physalis philadelphica 



Trich bar is t ri notata. 



Physalis virginiana ambigua 



Trichobaris trinotata. 



Solanum carolinense 



Solanum eleagnifolium 



(Trichobaris trinotata. 

 \Anthonomus nigrinus Boh. 

 Anthonomus seneolus Dietz 



Solanum heterodoxum 



Trichobaris texana Lee 



Solanum melongena (egg plant) 



Trichobaris trinotata Say. 

 Trichobaris texana Lee. 



Solanum rostratum 



Solanum rostratum 



Anthonomus seneolus Dietz. 



Solanum torreyi 



{Anthonomus seneolus. 

 {Trichobaris texana Lee. 

 (Anthonomus nigrinus Boh. 

 {Trichobaris trinotata Say. 



Anthonomus eugenii Cano. 

 ( Trichobaris trinotata Say. 

 { Trichobaris compacta Casey. 



Trichobaris trinotata Say. 



Lixus scrobicollis Boh 



Solanum tuberosum (potato) 



Capsicum annuum (pepper) 



Datura stramonium 



Datura tatula 



Ambrosia artemisixfolia 



Ambrosia psilostachya 



Lixus scrobicollis 



Ambrosia trijida 



Lixus scrobicollis 



Grindelia inuloides 



Anthonomus squamosus Lee. 

 Anthonomus squamosus. 

 Anthonomus heterothecse Pierce. 



Grindelia squarrosa nuda 



Heterotheca subaxillaris 



Aster salicifolius 



Anthonomus aphanostephi Pieree. 

 Desmoris scapalis Lee. 

 Brachytarsus alternatus Say. 

 Anthonomus aphanostephi Pieree. 

 Lixus scrobicol is Boh. 



Sideranthus rubiqinosus 



Sideranthus rubiginosus 



Aphanostephus sHrrobasis 



Helianthus spp. (sunflower).. 



Helenium tenuifolium 



Baris cuneipennis Casey. 





16. A SUMMARY OF THE MORE IMPORTANT BIOLOGICAL FACTS. 



1 . The boll weevil has 54 enemies, including parasites and predators. 



2. These enemies are native to other insects which are to be found 

 in the vicinity of cotton fields. 



3. The interrelationships of the boll weevil and its parasites with 

 surrounding insects are very compKcated. 



4. The parasites are sometimes found in great numbers. 



5. The cotton plant, by its production of nectar, furnishes a very 

 powerful attraction for parasites and predatory insects. 



6. The development of the boll- weevil parasites is as rapid as that 

 of the boll weevil. 



7. Most of the parasite species are well distributed. 



8. The parasite species attack other hosts in the spring and have 

 a generation before the boll weevil is ready for them. 



9. New species of parasites are becoming adapted to the weevil 

 each year. 



