Browsing by Author "Henderson, Robert G."
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- Biology and natural control of the white pine weevil, Pissodes strobi (Peck), in VirginiaHarman, Dan M. (Virginia Tech, 1966-06-05)Ovariole development and termination of diapause in the white pine weevil were studied by dissecting weevils at various intervals throughout the winter. Old-generation adults brought into the laboratory November produced viable eggs within 5 days. New generation adults brought into the laboratory on November 4 produced viable eggs during November. Viable eggs were deposited by other new-generation adults after 10 to 15 day. at room temperature in winter. On each of the 3 collection date studied, new generation adult produced viable eggs without copulating after collection from hibernation indicating that capulation occurs in the fall. There was no evidence of progressive ovariole development throughout the winter. New generation adults which were isolated as soon as they emerged from the shoots and maintained at constant room temperature had poorly developed ovarioles by November 20 and produced no eggs. Weevil flight and dispersal through a white pine plantation was studied by releasing 409 marked weevils at a central point within a l431-tree plantation and checking every tree at 5-day intervals. Weevils flew readily at the time of re1ease. Marked weevils were recorded throughout the plantation. which extended as far as 330 feet from the release point. A few weevils were observed on scattered white pines 200-300 yards from the release point beyond a hardwood barrier. Total numbers of weevils present on the leaders increased from April 26 to May 5, after which numbers steadily decreased. By June 15, only 20 weevils were observed on the leaders.
- Performance of tobacco varieties and breeding lines tested in Virginia in 1957Henderson, Robert G. (Virginia Agricultural Experiment Station, 1959-01)Results of testing of tobacco varieties and breeding lines conducted at several locations in Virginia
- Performance of tobacco varieties and breeding lines tested in Virginia in 1958 and 1959(Virginia Agricultural Experiment Station, 1960-04)Covers such characteristics as yielding ability, disease resistance, desirable plant characteristics, ease of curing and acceptability
- Performance of tobacco varieties and breeding lines tested in Virginia in 1960, 1961, and 1962Crews, J. W.; Rogers, M. J.; Laprade, J. L.; Troutman, Joseph L.; Henderson, Robert G. (Virginia Agricultural Experiment Station, 1963-06)Results of tobacco variety testing performed in Virginia 1960-1962
- Performance of tobacco varieties and breeding lines tested in Virginia in 1963Crews, J. W.; Rogers, M. J.; Laprade, J. L.; Troutman, Joseph L.; Henderson, Robert G. (Virginia Agricultural Experiment Station, 1964-08)Performance trials are conducted to obtain data on plant characteristics, yield and quality of released varieties and advanced breeding lines for flue cured tobacco
- Sears special and Virginia 310: new varieties of Virginia fire-cured tobaccoHenderson, Robert G.; Spasoff, L. (Virginia Polytechnic Institute. Research Division, 1968-12)Describes Sears Special and Virginia 310, two new varieties of tobacco released for seed increase
- A study of Sclerotium rolfsii, sacc.Jefferson, R. N. (Virginia Agricultural and Mechanical College and Polytechnic Institute, 1936)Sclerotium rolfaii Secc. is a fungus that is prevalent throughout the southern states, and at times causes very serious losses to farm crops and ornamental plants. It causes a disease known as Sclerotium Wilt, Southern Wilt, or Southern Blight. The Virginia Agricultural Experiment Station has received many complaints of Sclerotium Wilt on ornamental plants in the last few years, but has been unable to give any definite recommendations because no satisfactory method of control has been developed. the object of this investigation was to study the characteristics of the fungus and to discover, if possible, some method or methods of checking the disease when established.
- Va. 331 A fire-cured variety with black shank resistanceHenderson, Robert G.; Sears, R.D.; Spasoff, Luben (Virginia Agricultural Experiment Station, 1964-10)Until recently no fire cured tobacco was available with black shank resistance. The need for such a variety is so acute that Va. 331 will be released at this time.
- Virginia 509: a black shank, wildfire, and black root rot resistant variety of Virginia tobaccoHenderson, Robert G.; Spasoff, L.; Neas, M. O.; McClaugherty, F. S.; Link, Leo A. (Virginia Polytechnic Institute. Research Division, 1968-12)Describes a high-yielding burley tobacco variety which has resistance to black shank, wildfire, black root rot and Fusarium wilt
- Virginia fire-cured tobacco: effect of irrigation, topping height, and harvesting method on yield and qualitySears, R. D.; Henderson, Robert G.; Wilmouth, R. R. (Virginia Polytechnic Institute and State University. Research Division, 1971-02)Results of an experiment involving irrigation, topping height and harvesting procedures to see if returns could be increased