

19Z8 - Morgan, A. C, and S. E. Crumb. Notes on the chemotropic responses of certain 

 insects. J. Econ. Ent. 21 (6):91 3-920. 



Contains a statement that the boll weevil was not attracted to pyridine. 



TESTING METHODS AND TECHNIQUES 



1898 - Howard, L. O. Some miscellaneous results of the work of the Division of Ento- 

 mology, Cotton Field Insects. U. S. D. A. Div. Ent. B. 18:85-88. 



Record of insects caught in cotton field during a test of attraction of lights 

 for the boll weevil. No weevils were caught, while 24,492 other specimens were 



taken. 



1906 - Hinds, W. E. Laboratory methods in the cotton boll weevil investigations. 

 U. S. D. A. Bur. Ent. B. 60:111-119. Sept. 22. 



Descriptions are given of various devices used by the Bureau of Entomology 

 in conducting investigations of the boll weevil. 



1909 - Hood, C. E. Types of cages found useful in parasite work. J. Econ. Ent. 2(2): 

 121-124. 



The author describes several types of cages used to rear boll weevils and 

 parasites. 



1926 - GeHauf, B. Breeding of boll weevils from infested cotton squares. J. Econ. Ent. 

 19(4):593-599. 



The method that was found best for the production of large numbers of A. 

 grandis for experimental purposes is described. Breeding and oviposition were 

 carried out in the field under natural conditions and hatching in incubators. It 

 was found that too much moisture caused the squares to rot before the weevil had 

 reached its full growth. 



1929 - Anonymous. Fla. Agr. Expt. Sta. Ann. Rpt. 1929:50. 



An apparatus for determining the thermotropic reaction of insects was de- 

 vised. Boll weevils showed definite orientation response to 26°F. at the chilled 

 and 130°F. at the heated end of the apparatus, respectively. Geotropic reactions 

 were also studied. Studies on resumption of egg laying by hibernated weevils in- 

 dicated that fertile eggs could be laid without a preliminary 5-day square diet. 



Isolated weevils laid eggs as many as 201 days after copulation. Females 

 are consequently able to lay fertile eggs on emerging from hibernation. 



1929 - Grossman, E. F. Thermotropism of the Mexican cotton boll weevil. J. Econ. 

 Ent. 22(4):662-665. 



A new apparatus for determining the thermotropic reaction of Anthonomus 

 grandis (cotton boll weevil) is described. It consists of 16 copper bars, the ends 

 of which form a plane so arranged that the weevils placed on them must be in 

 contact with at least 2. The other ends of the bars are heated or chilled; they 

 vary in length so that the temperature differs progressively. The average dif- 

 ference between 2 adjacent bars was 4°F.; the exact temperature of each bar can 

 be ascertained by means of a thermocouple. Some differences were observed in 

 the reaction of weevils ready for hibernation or removed from hibernation and 

 those captured in the field in August. Variations in light conditions also had some 

 effect. The average temperature at which the weevils definitely reacted was 26°F. 

 at the chilled end of the plane and 130°F. at the heated end. 



1931 - Folsom, J. W. A chemotropometer. J. Econ. Ent. 24(4):827-833. 



A simple form of chemotropic apparatus and its method of operation are 

 described. Records of chemotropic reactions of Anthonomus grandis Boh. ob- 

 tained with this apparatus are given. 



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