ing was delayed, with a subsequent delay in 

 time of harvest. Total yield decreased as per- 

 centage of squares damaged increased through- 

 out the season. Grade indexes and lint values 

 indicated no significant loss in quality of lint at 

 the different infestation levels. Differences in 

 value of lint per acre for the four treatments 

 actually reflected differences in yield. 



113. Lukefahr, M. J., and Martin, D. F. 

 A native host plant of the boll weevil and other 

 cotton insects. Jour. Econ. Ent. 55: 150-151. 

 1962. 



Cienfuegosia sulphuria, a wild malvaceous 

 plant, was found to be a host of the boll weevil. 

 Other cotton insect pests reared from this 

 plant were the cotton square borer (Strymon 

 melinus and Noctuelia rufofascialis) . The cot- 

 ton leafworm completed its development when 

 larvae were placed on the plant. 



114. Lukefahr, M. J., and Martin, D. F. 

 Additional non-cotton hosts of the boll weevil 

 and cotton leafworm. Jour. Econ. Ent. 58: 

 784-785. 1965. 



Four additional species were found to be 

 hosts of the boll weevil. These were Cienfue- 

 gosia argentinia Garcke and C. drummondii 

 (A. Gray) Lewton of South America, C. hilde- 

 brandtii Garcke of Africa, and Thespesia 

 lampas Cav. of Asia. The susceptibility of the 

 various species differed. In general, the species 

 that are not found in areas inhabited by the 

 boll weevil were the least susceptible. Two ad- 

 ditional species (C. hildebrandtii Garcke and 

 C. argentinia Garcke) were found to be hosts 

 of the cotton leafworm, Alabama argillacea 

 (Hubner), which showed a preference for the 

 same species as the boll weevil. 



115. McGarr, R. L., and Chapman, A. J. 

 Control of three important cotton insects in the 

 lower Rio Grande Valley in 1960. Jour. Econ. 

 Ent. 56: 902-903. 1963. 



Field tests showed that Bayer 29493 plus 

 DDT, methyl parathion plus DDT, toxaphene 

 plus DDT, or strobane plus DDT did not give 

 outstanding control of the boll weevil. Sevin 

 was effective as a spray or dust. Telodrin was 

 effective against the boll weevil. Results are 

 given for the bollworm and pink bollworm. 



116. McGarr, R. L., Chapman, A. J., and 

 Martin, D. F. Field tests with several insec- 

 ticides for control of pink bollworm. boll weevil, 

 and bollworm. Jour. Econ. Ent. 58: 693-694. 

 1965. 



In field-plot tests in the lower Rio Grande 

 Valley of Texas in 1961 and 1962, of four car- 

 bamates tested, carbaryl and Bayer 37344 gave 

 the best control of pink bollworm and boll 

 weevil and Zectron and Bayer 44646 gave 

 significantly better results against the boll- 

 worm-tobacco budworm complex. Imidan, an 

 phosphorus compound, gave fair control of 

 pink bollworm and boll weevil but was ineffec- 

 tive against the bollworm complex. A standard 



dieldrin-DDT mixture failed to give satisfac- 

 tory control of boll weevils and bollworm com- 

 plex in one experiment. 



117. McLaughlin, R. E. Infectivity tests 

 with Beauveria bassiana (Balsamo) Vuillemin 

 on Anthonomus grandis Boheman. Jour. In- 

 sect Pathol. 4: 386-388. 1962. 



Biological control tests in Mississippi and 

 Texas showed that Beauveria bassiana can in- 

 fect larvae, pupae, and adult boll weevils in the 

 laboratory. High moisture levels were main- 

 tained. Further investigations are being con- 

 ducted. 



118. McLaughlin, R. E. Mattesia grandis 

 n. sp., a sporozoan pathogen of the boll weevil, 

 Anthonomus grandis Boheman. Jour. Proto- 

 zool. 12: 405-413. 1965. 



Laboratory cultures of the boll weevil became 

 infected with Mattesia grandis n. sp. (Neogre- 

 garinida, Ophryocystidae) . The ensuing epi- 

 zootic resulted in destruction of the weevil 

 colony. Infection occurred per os in larval and 

 adult weevils. Sporozoites penetrate the intes- 

 tinal wall and infect adipose tissue cells. Mi- 

 cronuclear schizogony with production of 

 merozoites is the primary method of multipli- 

 cation and spread to new foci. Micronuclear 

 schizonts may grow as large as 30/i in size and 

 produce up to 200 or so merozoites, which may 

 be 20/x long and lfi—2.5/x wide and are motile. 

 Macronuclear schizonts are formed from these 

 first schizogony merozoites, and can become 

 20,u-30/x in diameter and produce up to 80 or 

 so macronuclear merozoites. These can be 15/x 

 long but 2^-3/x wide with limited motility. 

 Second schizogony merozoites form gamonts, 

 which pair and form gametocysts. Nuclear di- 

 vision results in four equal-sized nuclei and 

 two pairs of residual nuclei. Four gametes are 

 formed by cytoplasmic construction around the 

 nuclei. The gametes rapidly pair to form two 

 zygotes in the gametocyst, normally resulting 

 in two spores. Nuclear pairing in one of the 

 two zygotes often lags slightly behind. Abnor- 

 mal development of zygotes is rare, but the re- 

 sult sometimes is one spore with three poles and 

 a normal spore or only one spore. Near matu- 

 rity, gametocysts are about 12.5/j. long and 

 14.0/j, wide, with the gametocyst wall tightly 

 stretched over the poles of the spores. Spores 

 often are slightly flattened on the adjacent side 

 in the gametocyst, but they frequently attained 

 evenly curved walls on all sides after release. 

 The spores are octozoic, with sporozoite devel- 

 opment occurring after release from the game- 

 tocyst. Spores measured 7.1/i x 11.8/a. Char- 

 acters are given to separate M. grandis from 

 other species of Mattesia. 



119. McLaughlin, R. E. Some relation- 

 ships between the boll weevil, Anthonomus 

 grandis, Boheman, and Mattesia grandis, Mc- 

 Laughlin (Protozoa: Neogregarinida). Jour. 

 Invert. Pathol. 7 : 464-473. 1965. 





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