CONTENTS. 



Department Bulletin No. 926. — Studies in the Biology of the Mexi- 

 can Cotton Boll Weevil on Short-staple Upland, and Sea Island 



Cottons : Page. 



Introduction 1 



Historical review 2 



Scope of the present life-history studies = 3 



Methods of study under outdoor insectary conditions 3 



Methods of study under field conditions 4 



Food plants of the boll weevil 5 



The boll weevil on Sea Island cotton 6 



Longevity of adult boll weevils on cottons 7 



The size of the cotton square attacked by boll weevils 10 



Locations for oviposition on cotton squares 1 11 



Period from emergence to oviposition 11 



Oviposition period under insectary conditions 11 



Summary of fecundity of boll weevil on cottons under insectary con- 

 ditions 13 



The average developmental period under outdoor insectary con- 

 ditions 11 



The developmental period under held conditions 15 



Egg-laying activity of weevils under field conditions 19 



Length of time upland cotton squares hang on plants after egg 



puncture 20 



Fecundity records on upland cotton under field conditions 21 



Summary of developmental period of first generation weevils in up- 

 land cotton squares under field conditions 22 



Developmental period of first generation weevils on cottons under 



field conditions 23 



Comparison of the developmental period of the immature stages of 



weevil under field and insectary conditions 25 



Developmental period in green cotton bolls 2T 



Fecundity of the weevil in cotton bolls 2S 



The relation of temperature to the biology of the weevil 30 



The developmental period on different types of soil 32 



The effect of the determinate growth of the cotton plant on the 



biology of the boll weevil 32 



Hibernation of the boll weevil in Florida 33 



General summary 43 



Department Bulletin No. 927. — Commercial Utilization of Waste 

 Seed From the Tomato Pulping Industry. 



Profitable utilization of waste materials 1 



Nature and source of tomato waste 1 2 



Distribution and quantity of tomatoes pulped annually 2 



Quantity of seed available ' : 4 



Commercial products obtainable from tomato seed 1 4 



Procedure in handling tomato waste 5 



The use of exhaust steam compared with live steam 15 



Extracting the oil from tomato seed 16 



Refining and deodorizing the oil 19 



Oil cake and meal 20 



Commercial procedure for utilizing tomato waste 20 



Cost of handling the waste 23 



Possible returns and net profits from oil, cake, and meaL 28 



Summary 29 



1 



