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The weed control and the phytotoxicity on sugar cane of DCMU and CMU combined with Uracils (bromacil and terbacil) is discussed in this paper. The dosis used were 3 kg + 1 l for each combination. The control of Rottboellia exaltata was fairly good with bromacil + DCMU; nevertheless, cane yields were slightly lower in plots under this treatments. On Cyperus rotundus, none of the herbicides used ...

SUBJECT: lutte chimique; malezas; mauvaise herbe; weeds; canne a sucre

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de plantas [0138-8932]

A weed competition study in trasplanted onions and cabbage is reported. Two experiments were carried out for every crop during 1975-76 and 1976-77, where were included weeded plots up to 70 days after transplanting and for the whole vegetative cycle, as well as inversely weedy and then weeded. The results showed losses of the onions yields of 22-100 % and 7-41 % for cabbage, the sugar conte ...

SUBJECT: malezas; oignon; mauvaise herbe; onions; cebolla

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de plantas [0138-8932]

The annual dynamic of the fructifications of Mycosphaerella musicola Leach in the Sigatoka disease spots on banana leaves was studied. The results show that seasonal fluctuations on perithecium and spermogonium production are closely related to the annual patterns of rain and the daily mean temperatures, and to the presence of very heavy infections on the leaves. At the beginning of the dry a ...

SUBJECT: mycosphaerella musicola; enfermedades fungosas; musa paradisiaca; fungal diseases; maladie fongique

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de Plantas

A study on chemical control of weeds was made in order to assay the effect of simazine and diuron at 3,2 - 4,8 kg/ha i.a., as well as of a mixture of simazine + ametrine at 1,6 + 1,6 and 2,4 + 2,4 kg/ ha a.i., all sprays having been applied twice as preemergence treatments on the Robusta clone of Cavendish group planted on clay textured latosolic soil. A good effectiveness was obtained again ...

SUBJECT: lutte chimique; malezas; mauvaise herbe; musa; herbicide

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de plantas [0138-8932]

The effects of temperatura on the intensity and dinamic of germination, viability of conidia miceliar growth and sporulation of Cercospora musae Zimm. (conidial stage of Mvcosphaerella musicola Leach) were studied. The cardinals temperatures for the germination were minimal 8°C, optimal 25°C and maximal 37,5°C and for the sporulation 10-15, 25 and 37,5°C respectively. The conidial germination ...

SUBJECT: experimentation en laboratoire; laboratory experimentation; musa; enfermedades fungosas; fungal diseases

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de Plantas

Se estudió el efecto de la humedad relativa sobre la germinación de los conidios y la esporulación de Cercospora musae, Zimm. Los experimentos rea¬lizados demuestran que los conidios del patógeno no germinan en humedades relativas cercanas al 100 % y que sólo este proceso tiene lugar en pre¬sencia de agua libre sobre la superficie de las hojas. El proceso esporulativo se desarrolla a partir de ...

SUBJECT: relative humidity; musa; environmental factors; facteur du milieu; humidite relative

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de Plantas

The entomological fauna of grain, seeds, and other plant products storages in Cuba is listed. Seventy samplings in 14 storages, were performed from june 1971 to june 1974. Samples were screened, through a set of sieves (2,5 mm; 2,0 mm; 1,25 mm; 0,5 mm, and 0,4 mm) on a vibrator in order to separate the grains from the residues left by the insects, for best observation. Twenty-eight insect s ...

SUBJECT: stored products pests; protection des plantes; pests; lepidoptera; plagas

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de plantas [0138-8932]

Studies for obtaining potato mother-plants were carried out from foreign and national stocks, submitted to tuber and plant index respectively. By visual inspections diseased, atypical and juvenile plants were eliminated. The appearance of virus was demostrated by the way of serological analysis and tests plants. Ten of healthy potato plants was selected and eighty five tubers was harvested fro ...

SUBJECT: viruses; tecnicas inmunologicas; potatoes; semence; seed

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de plantas [0138-8932]

Since January 1977, and during two months periodical inspection in consummers potato fields, of Havana province were performed. Our aim was to determine the percentage of virus diseases in relation to an established scale of symptoms, as well as the identification of some of causal agents by means of serological technique and plant indicators. The presence of PVX, PVY and virus complexes was d ...

SUBJECT: viruses; tecnicas inmunologicas; potatoes; identification; pomme de terre

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de plantas [0138-8932]

A study on population dynamics of Phyllocoptruta oleivora Ashmead was carried out in a 25-30 years old orange grove planted to var. Valencia. The distribution of the different developntent stages of this mite was determined and it was found that mites went over to the fruits at blossoming end, and that their diameter was less than 0,5 cm, their population having increased in April and May. Dur ...

SUBJECT: damage; pests; fenologia; phenology; champignon entomopathogene

POSTED TO: Ciencia y Tecnica en la Agricultura. Proteccion de plantas [0138-8932]