Pathological alterations in the ovaries of culex pipiens induced by fixed oil extracts from thevetia peruvine, datura stramonium and acacia sp

The fixed oil extracts from Thevetia peruvine, Datura stramonium and Acacia sp were tested on Culex pipiens larvae. The estimated sublethal concentrations [LC50] were used in the present study. The reproductive potential of females and the histochemistry of their ovaries were determined. The results indicated that oil treatments of larvae caused drastic changes in reproduction potential of female mosquito including the ovarian development in the first gonotrophic cycle, fecundity and fertility of treated females. Histological and histochemical studies revealed clear changes in the oocytes of females derived from treated larvae. Treatment with the oils reduced the vitellogenesis, synthesis of proteins, carbohydrates, lipid contents, DNA and RNA materials. The reproduction was always significant and may reflect the shortage in reproductive potential, the state of being disturbed. Generally, these fixed oils merit further investigations as a potential suppressant of Culex pipiens because their abilities to kill the early stages inhibit growth and development of ovaries and reduce the reproductive potential of adult females. The three oils have variable activities but they are similar in their mode and site of actions

Incidencia de Alternaria crassa (Sacc) Rands en 3 especies herbáceas del género Datura L. (Comunicación) / Incidences of Alternaria crassa Runds on three herbaceous of genus Datura L. (Comunication)

Se realizó un estudio de la incidencia del hongo Alternaria crassa (Sacc.) Rands en 3 especies herbáceas del género Datura L.; D. inoxia Mill., D. stramonium L. var stramonium y D. velutinosa Fuentes, durante los meses de junio, julio y agosto de 1978 en la Estación Experimental de Plantas Medicinales "Dr.Juan T. Roig", San Antonio de los Baños, La Habana. Se observaron diferencias significativas entre el valor de la enfermedad en las especies y entre las fechas, e interacción entre ambos, se encontró que en D. inoxia y D. stramonium, la enfermedad alcanzó su valor máximo (100), mientras que D. velutinosa resultó menos susceptible

Incidencia de Alternaria crassa (Sacc) Rands en Datura candida (Pers) Safford I en períodos diferentes / Incidence of Alternaria crassa (Sacc) Rands on Datura candida (Pers) Safford I in differents periods

Se realiza un estudio del desarrollo de la enfermedad producida por el hongo Alternaria crassa (Sacc) Rands en Datura candida (Pers) Safford, en períodos diferentes (1978 y 1979). Se utiliza para la evaluación de la enfermedad la metodología propuesta por Fornet (1983). Se observa en los 2 casos, la intensidad máxima de la enfermedad de mayo a septiembre, correspondiendo a los meses invernales los valores menores