The neogregarine infects larvae and adults 

 of the boll weevil when the spores are ingested. 

 All instars, pupae, and adults are susceptible. 

 Usually sporogony and production of free 

 spores occurred 7 days after infection. The 

 pathogen development was retarded in adults 

 when little or no lipoid material was deposited 

 in the adipose tissue. When the adult diet was 

 altered to result in the deposition of fat, normal 

 development resumed. The rate of development 

 of the pathogen also appeared to vary directly 

 with changes in temperature. Infected females 

 laid fewer eggs per day than healthy females. 



120. McLaughlin, R. E., and Allen, G. 

 Description of hemocytes and the coagulation 

 process in the boll weevil, Anthonomus grandis 

 Boheman (Curculionidae). Biol. Bui. 128: 

 112-124. 1965. 



Hemocytes were classified into four types. 

 Prohemocytes had a large nucleus and a thin 

 band of peripheral cytoplasm. All gradations 

 were observed to spherical plasmatocytes. Plas- 

 matocytes were characterized by their exten- 

 sive pleomorphis capability, a cytoplasm that 

 varied from finely granular with few larger 

 granules and that was dense and uniform to 

 phase contrast or heterogeneous with vacuoles 

 or various inclusions. They assumed pseudopo- 

 dial, fusiform shapes or irregular shapes 

 during the process of stranding during coagu- 

 lation. Plasmatocytes were phagocytic. Adipo- 

 hemocytes were filled with lipoid globules. 

 Spherule cells were characterized by having 

 one to several large, amorphous globules. A 

 slow process of network formation occurred by 

 stranding of plasmatocytes. Networks were 

 formed by extension, retraction, and anastomo- 

 sis of cytoplasmic strands and represented the 

 only observed process of coagulation. 



121. McLaughlin, R. E., and Keller, J. C. 

 Antibiotic control of an epizootic caused by 

 Serratia marcescens, Bizio in the boll weevil, 

 Anthonomus grandis Boheman. Jour. Insect 

 Pathol. 6: 481-485. 1964. 



Adults of the boll weevil were collected at a 

 rearing station in Mexico and shipped to the 

 Boll Weevil Laboratory, State College, Miss. 

 Extremely high weevil mortality occurred at 

 the rearing station and in transit, and no 

 healthy weevils were available for experimen- 

 tal use. Mortality was caused by Serratia 

 marcescens, Bizio. An antibiotic, in 10 percent 

 sugar solution substituted for cotton plant ma- 

 terial as food at the rearing station and during 

 shipment, effectively controlled the epizootic. 

 Novobiocin and tetracycline were the active 

 compounds. 



122. Matteson, J. W., and Taft, H. M. 

 Carbamate-induced systemic repellency to boll 

 weevil on cotton. Jour. Eton. Ent. 56: 892-893. 

 1963. 



Thirty-eight carbamates were screened as 

 systemic repellents to boll weevil on seedling 



cotton plants. Of the 15 compounds released for 

 publication, six exhibited systemic repellent 

 properties. Compared with the standard Bayer 

 39007, three of these six were more repellent 

 than toxic and three were more toxic than re- 

 pellent. Because of the lack of correlation be- 

 tween the repellent and toxic action of the six, 

 it is believed that the mode of action that in- 

 duces toxicity is independent of that which 

 induces repellency. 



123. Matteson, J. W., and Taft, H. M. The 

 effect of various adjuvants on the systemic in- 

 secticidal activity of phorate and Zectran. 

 Jour. Econ. Ent. 57:325-326. 1964. 



Eighty-seven adjuvants were screened for 

 their influence. The insecticides at 100 p. p.m. 

 and the adjuvants at 50 p. p.m. were added to 

 plant-nutrient solutions in which cotton seed- 

 lings were placed. Boll weevils were confined on 

 the plants for 48 hours. The mortality of wee- 

 vils on plants in insecticide plus adjuvant was 

 compared with that on plants exposed to Zec- 

 tran alone. None of the adjuvants affected the 

 activity of phorate; however, three significantly 

 enhanced the systemic activity of Zectran. All 

 three were quaternary ammonium chlorides 

 and the only chemicals of this type included in 

 the tests. No synergistic effect was involved; 

 the adjuvants were either affecting the roots 

 or the insecticide in such a manner that the 

 insecticidal activity of Zectran was increased. 



124. Matteson, J. W., Taft, H. M., and 

 Rainwater, C. F. Chemically induced resist- 

 ance in the cotton plant to attack bv the boll 

 weevil. Jour. Econ. Ent. 56: 189-192. 1963. 



Plant extracts representing 117 families and 

 358 species and 400 fermentation filtrates rep- 

 resenting a wide spectrum of bacteria, molds, 

 yeasts, and fleshy fungi were screened against 

 the boll weevil-cotton plant complex for system- 

 ically induced repellency, attractancy, and ef- 

 fects on fecundity and development of larvae in 

 squares. The results obtained were negative. 



Nine compounds of known chemical identity 

 were screened. One of these, Bayer 39007, ex- 

 hibited definite systemically induced repellency 

 to the boll weevil in seedling cotton plants and 

 in plants in the four-leaf stage in the labora- 

 tory. 



125. Maxwell, F. G., Jenkins, J. N., and 

 Keller, J. C. Boll weevil repellent from the 

 volatile substance of cotton. Jour. Econ. Ent. 

 56: 894-895. 1963. 



During the process of purifying a crude boll 

 weevil attractant extract in chloroform ob- 

 tained from cotton, the residue remaining after 

 chloroform evaporation at room temperature 

 was biologically assayed and found to be repel- 

 lent to the boll weevil. Treated cotton seedlings 

 were protected from weevils for 5 to 12 hours 

 and treated squares and bolls in presence of 

 untreated controls for 36 hours. Weevils ex- 

 posed to treated bolls and squares, without 



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