Browsing by Subject "Diseases and pests"
Now showing items 21-40 of 55
-
(Texas A&M University. Libraries, 1989)Field and greenhouse experiments were conducted to evaluate the effect of genotype mixtures on the development of sorghum leaf blight caused by Exserohilum turcicum. For the field experiments, three locations of Central ...
-
(Texas A&M University. Libraries, 1980)The effect of soil moisture, soil temperature and soil pH on sorghum downy mildew (SDM) disease incidence (DI) was evaluated. In the field, when sorghum and maize hosts were planted at different dates during the cropping ...
-
(Texas A&M University. Libraries, 1980)Ultrathin sections of tissues, organs, and whole bodies of black-faced leafhoppers, Graminella nigrifrons (Forbes), were examined by transmission electron microscopy. Virions were observed adsorbed only to the intima of ...
-
(Texas A&M University. Libraries, 1990)Three-component mixtures of wheat genotypes were evaluated for yield performance and effectiveness of control of wheat leaf rust, caused by Puccinia recondita Rob ex Desm. The studies were conducted in the 1985-86 and ...
-
(Texas A&M University. Libraries, 1981)Sorghum grain molds are defined as prematurity diseases resulting from infection of spikelets or developing kernels as early as anthesis by parasitic field fungi. Curvularia spp and Fusarium spp are the predominant grain ...
-
(Texas A&M University. Libraries, 1982)The pecan, Carya illinoensis (Wang.) K. Koch, was subjected to a life table analysis in order to assess the impact of pests and pathogens in various sites and treatment regimes in Texas. Nut clusters were initially tagged ...
-
(Texas A&M University. Libraries, 1986)Research was conducted to quantify volatile compounds emanating from the flower buds of seven cotton (Gossypium hirsutum L. ) cultivars at two planting location, to determine the influence of the volatiles on boll weevil ...
-
(Texas A&M University. Libraries, 1985)Shuck disorders are a common production problem of Texas pecan producers. The shuck disorders observed in this study were not caused by stem end blight or shuck dieback. The principal shuck disorders studied were called ...
-
(Texas A&M University. Libraries, 1993)Insecticides have been applied to cotton in combination with a variety of diluents and agrichemicals. Preliminary studies suggested that one agrichemical or diluent can improve, have no effect, or decrease insecticidal ...
-
Inheritance of resistance to southwestern cotton rust within upland cotton (Gossypium hirsutum L.) (Texas A&M University. Libraries, 1983)An investigation was conducted to elucidate the manner of resistance expression in the cotyledons, petioles, and stems of Gossypium hirsutum L. to the pathogen Puccinia cacabata Arth. and Holw. Confirmation of previous ...
-
(Texas A&M University. Libraries, 1978)The cotton ecosystem can be seen as a dynamic biological system that occasionally must be adjusted when one element, such as insect pests, gains undue strength. The objective of this research has been to develop a computerized, ...
-
(Texas A&M University. Libraries, 1989)Aphanomyces cochlioides Drechs. causes sugar beet black root. The fungus induces an acute seedling blight and a chronic root rot. Severe tip root rot may occur. This tip root rot phase is more damaging in Texas than in ...
-
(Texas A&M University. Libraries, 1987)The internal microflora associated with the salivary gland, whole body, and egg of the cotton fleahopper (CFH), Pseudatomoscelis seriatus (Reuter) (Hemiptera: Miridae), were isolated and identified. Approximately 60% of ...
-
(Texas A&M University. Libraries, 1986)Isozyme analysis was used to assess the genetic variability of Sporisorium reilianum from three field populations in Texas from 1982 through 1984. An effective horizontal starch gel electrophoresis technique was developed. ...
-
(Texas A&M University. Libraries, 1983)A life table study was conducted in Sri Lanka during 1982 to contribute understanding to the population dynamics of T. incertulas in the rice agroecosystem. The determination of larval instars revealed the occurrence of 5 ...
-
(Texas A&M University. Libraries, 1984)Growth chamber studies were conducted to develop a visual test for differentiating sorghum cultivar Fe-efficiency in CaCO(,3) buffered nutrient culture. Nine sorghum cultivars were germinated in vermiculite and grown for ...
-
(Texas A&M University. Libraries, 1986)The spatial distribution of Liriomyza trifolii (Burgess) and its associated hymenopterous parasite complex was determined in field grown bell peppers at Weslaco, TX. L. trifolii larvae were most numerous during the first ...
-
(Texas A&M University. Libraries, 1981)Seven sorghum inbred lines and 42 F1 hybrids from a set of diallel crosses among the lines were evaluated for reaction to head smut Sphacelotheca reiliana (Kuhn) Clint. Known vertical genes stacked into a single genotype ...
-
(Texas A&M University. Libraries, 1986)Sixteen Peronosclerospora sorghi populations from seven countries were evaluated for variability in their virulence pattern on sorghum. All populations were identified as distinct vertical pathotypes based on differential ...
-
(Texas A&M University. Libraries, 1983)A mathematical model that describes the population dynamics of a cotton crop and the boll weevil is discussed. A system of partial differential equations forms the model's core. A finite-difference solution procedure is ...