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Studies on the shootborer Hypsipyla grandella (Zeller) (Lep., Pyralidae). XXIII. Electroantennograms (EAG) as a tool in the analysis of insect attractants
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1974-01)Las respuestas olfatorias en los insectos, tales como las representadas en un electroantenograma (EAG), rinden información sobre la capacidad sensoria de oler sustancias que sirven para reconocer parejas, alimentos, o ... -
Influencia del suministro de nitrógeno en la absorción de algunos minerales por el frijol (Phaseolus vulgaris L.)
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1974-01)The investigation deals with the quantitative determination of ion uptake by the bean plant (Phaseolus vulgaris L.) namely, NO3-, Ca2+, Mg2+, K+ and phosphate, during the time elapsed between germination and preflowering ... -
Efeito do etileno sobre o tipo e qualidade da bebida de café
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1974-01)Previous studies have shown that Ethrel accelerated the process of maturation so that coffee fruits mature 15 days after application. In the present work the effect of 2-chloro ethane-phosphonic acid (Ethrel) applications ... -
Reseña de libros
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1974-01)Este artículo presenta comentarios de distintos autores, sobre diferentes libros; un resumen, los datos de cada libro y la opinión personal acerca del mismo. -
Low cone yields of Honduras pine in Puerto Rico not due to pollen abortion
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1974-01)El examen de 2200 gramos de polen por árbol de 10 ejemplares de Pinus caribaea var. hondurensis indicó que el aborto del polen por árbol era de 9,80 % ± 0.93 de error estándar. Se concluye que el polen del pino en Puerto ... -
Susceptibilidad de las larvas de Sibine apicalis (Dyar) a Bacillus thuringiensis var. kurstaki
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1974-01)It is shown that field applications of a laboratory preparation of Bacillus thuringiensis are efective against the banana saddleback caterpillar, Sibine apicalis -
Ensaios preliminares em laboratório para o controle do manhoso, Chalcodermus bimaculatus Fiedler, em feijão-de-corda, Vigna sinensis Endl., com inseticidas orgânicos sintéticos
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1974-01)The preventive action of Endrín, Diazinon, Toxaphene, Chlordane and Malthion was studied for the control of Chalcodermus bimaculatus Fiedler, in cowpeas, Vigna sinensis Endl. The Endrin and Diazinon had good lethal and ... -
Photosynthetic activity in the mature leaves of Sorghum bicolor as influenced by growth retardants
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)Photosynthetic activity was measured in leaves of Sorghum bicolor 'Texas 414 treated with the growth retardants CCC, Alar, and Phosphon-D. The growth retardants increased leaf fresh weight and chlorophyll content by about ... -
Capacidad de intercambio catiónico en suelos de cenizas volcánicas recientes
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)The CEC of the soils and subsoils from eight sites derived from more or less recent volcanic ash from the Irazii massive in Costa Rica was studied The CEC deter-minations were carried out on field moist and an dried samples ... -
A bean, corn and manioc polyculture cropping system, 2: A comparison between the yield and economic return from monoculture and polyculture cropping systems
(Instituto Interamericano de Cooperación para la Agricultura (IICA), 1975-10-01)An experiment in which beans, maize, and cassava were planted in monoculture and polyculture systems was previously described in the first part of this report (Turrialba 25(3) 294-301 1975). The results of the experiment ...
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