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Search Results: 1 - 10 of 1388 matches for " citrus "
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Ocorrência de Aleurocanthus woglumi Ashby (Hemiptera: Aleyrodidae) no Maranh?o
Lemos, Raimunda N.S. de;Silva, Gilson S. da;Araújo, José R.G.;Chagas, Evandro F. das;Moreira, Aldenise A.;Soares, Ana T.M.;
Neotropical Entomology , 2006, DOI: 10.1590/S1519-566X2006000400021
Abstract: aleurocanthus woglumi ashby in citrus and mango crops in the state of maranh?o, brazil, is recorded. samples of 2003 and 2004 from several counties were identified and deposited in the insect collection of the laboratório de entomologia of the núcleo de biotecnologia agron?mica, universidade estadual do maranh?o.
Evaluation of six different groups of insecticides for the control of citrus psylla Diaphorina citri (Hemiptera: Psyllidae)
Farmanullah,Hayat Badshah,Rakhmin Gul
Songklanakarin Journal of Science and Technology , 2005,
Abstract: Studies on the efficacy of different insecticides against citrus psylla, Diaphorina citri (Hemiptera: Psyllidae) were carried out at Agricultural Research Institute, Tarnab, Peshawar, Pakistan. Six insecticides viz. Actara 25 WG, (thiamethoxam) Cascade 10 DC (Flufenoxuron), Match 050 EC (lufenuron), Thiodan 35 EC (endosulfan), Karate 2.5 EC (α-cyhalothrin), and Supracide 40 EC (methidathion), were tested for their effectiveness against D. citri. After first spray overall mean population of D. citri was 3.63, 4.75, 5.59, 6.66, 7.47, 8.11 per six inches tender shoot on Actara 25 WG, Cascade 10 DC, Match 050 EC, Thiodan 35 EC, Karate 2.5 EC and Supracide 40 EC treated plants respectively, while on control plants the population was 12.39. Similarly, after the second spray of each of the same insecticides the population of D. citri was 2.65, 4.23, 5.61, 6.41, 7.35 and 8.73 respectively. Where in controls there were 15.18 psyllids. Percent decrease of D. citri population in comparison to control after the first spray was highest in Actara 25 WG (72.20) followed by Cascade 10 DC (62.91), Match 050 EC (54.07), Thiodan 35 EC (47.61), Karate 2.5 EC (38.94) and Supracide 40 EC (35.74). After the second spray percent decrease over control recorded was highest in Actara 25 WG (83.54), followed by Cascade 10 DC (71.08), Match 050 EC (63.94), Thiodan 35 EC (60.79), Karate 2.5 EC (52.52) and Supracide 40 EC (45.62).
Citrus Pulp in Concentrates for Horses  [PDF]
Roberta A. Brandi, Adriana M. O. Tribucci, Julio C. C. Balieiro, Rhonda M. Hoffman, Ives C. S. Bueno
Food and Nutrition Sciences (FNS) , 2014, DOI: 10.4236/fns.2014.513138
Abstract:

The objective of this study was to evaluate the inclusion of increasing levels of citrus pulp in horse diets by investigating nutrient digestibility and the diet carbohydrate fractions, as well as to evaluate the correlation observed between the studied digestibility coefficients. Five adult horses were used. The horses were housed in individual stalls and had approximate ages of 3.5 years and live weights of 492.5 ± 44.5 kg. The experimental diets were formulated to meet the animals’ requirements for maintenance, establishing a roughage-to-concentrate ratio of 60:40 with the coast-cross hay as the roughage. The formulated concentrates contained increasing inclusion levels of citrus pulp (0%, 7%, 14%, 21%, and 28%). No effect of the diets was observed (p> 0.05) on the coefficients of digestibility of dry matter, organic matter, crude protein, ether extract, nitrogen-free extract, and non-fibrous carbohydrates; however, there was an effect (p< 0.05) on the soluble carbohydrates,y= 66.298 + 0.3724x. Citrus pulp may be used in horse diets at up to 28% concentrate. Citrus pulp is a safe energy source and benefits the digestibility of the nutrients and the carbohydrate fraction (both the fibrous and non-fibrous fractions) of the diet.

Effects of Three Nitrification Inhibitors on the Nitrogen Conversion in Purple Soil and Its Effect on the Nitrogen Uptake of Citrus Seedlings  [PDF]
Wenli Li, Zhenzhen Zhang, Danping Li, Chaoyi Guo, Yujiang Li, Min Yang, Xiaojun Shi, Yueqiang Zhang
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.96045
Abstract: Experiments were carried out to study the effects of nitrification inhibitors (NI) on the transformation of soil nitrogen (N) in purple soil and the effects on the N accumulation in different organs of citrus seedlings. In incubation and pot experiments, the rate of nitrification inhibitors 2-chloro-6-trichloro-methyl pyridine (Nitrapyrin), 3,4-dimethylpyrazole phosphate (DMPP) and dicyandiamide (DCD) was 2.4%, 1.0% and 5.0% of N rate, respectively. The trend of different nitrification inhibitors on ammonium nitrogen ( NH+4-N ), nitrate nitrogen ( NO-3-N ) content and pH was compared in incubation experiment; and the effect of different NI on the dry matter quality, N uptake of citrus seedling was studied in pot experiment. The results showed that NI could significantly inhibit soil nitrification in the early culture period (p < 0.05). The inhibitory degree of NI on nitrification showed the strong tendency at the beginning and then decreased. During the whole experiment, nitrification inhibition rates were 4.4% - 48.5% (En), 6.7% - 9.8% (DMPP) and 5.1% - 97.2% (DCD), respectively. Compared with the control, the application of NI increased the plant height and dry matter accumulation of potted citrus seedlings by 7.6% - 8.6% and 1.0% - 3.8%, respectively. And application of NI also increased the absorption of N by citrus roots and leaves by 9.0% - 17.9% and 0.6% - 7.2%, respectively. Overall, all the three nitrification inhibitors could significantly delay the soil nitrification process in purple soil, with the order of inhibition ability of DCD > DMPP > En (calculated as nitrogen application rate). Application of NI increased the height and dry matter accumulation, N accumulation of citrus seedling grown in pot experiment. Thus, application of NI would be helpful for improving N use efficiency in
Remiss?o de sintomas iniciais do declínio de citros pela aplica??o de reguladores vegetais
Prates, H.S.;Castro, P.R.C.;Guirado, N.;Melotto, E.;Muller, G.W.;
Anais da Escola Superior de Agricultura Luiz de Queiroz , 1988, DOI: 10.1590/S0071-12761988000100016
Abstract: for the experiment 13 year old pera sweet orange on rangpur lime stionic combinations from a plot in the mogi-gua?u county, s?o paulo state, were choosen. all plants showed in january 1984, unilateral brazilian decline (blight) symptoms. the diseased state of the plants was further confirmed by low water uptake. the statistically design was by completely randomized blocks, with 6 treatments, 4 replications and 1 tree per plot. the following growth regulator treatments were applied: 1) check; 2) gibberellic acid (ga) at 100ppm + 2,4-dichlorophenoxyacetic acid (2,4-d) at l0ppm; 3) ga at 50ppm + 2,4-d at 10ppm; 4) ga at 50ppm + naa at 15ppm + biofertilizer at 1ml/lwater; 6) ethyl-5-chlorine 1 h-3-indazolyl acetate (ethilclozate) at 0,1ml/l water. the products were applied in january 85. the growth regulators were applied as foliar sprays to thoroughly wet the leaves. five evaluation on the plant reactions were undertaken, respectively at 100,193,276,346 and 405 days from the first application of the products. the results obtained based on a visual score and kruskal-wallis test showed that treatments with ga at 50ppm + naa at 20ppm, ga at 100ppm + 2,4-d at 10ppm, and ga at 50ppm+naa at 15ppm+ bifertilizer at 1ml/lwater, presented satisfactory degree of symptoms remission that differed statistically from the check. this amelioration however found no parallelism to the results obtained by the water uptake test that still showed low levels. those figures however were a little higher in the treated plants than in the checks. these experiments will be continued for a few more years to determine whether or not the symptoms remission in the foliage is permanent and will lead eventually to the improvement of the whole plant.
Transformation of Xanthomonas axonopodis pv. citri by electroporation
Amaral, Alexandre M. do;Toledo, Cristiane P.;Baptista, Juliana C.;Machado, Marcos A.;
Fitopatologia Brasileira , 2005, DOI: 10.1590/S0100-41582005000300013
Abstract: this study describes the use of electroporation for transforming xanthomonas axonopodis pv. citri (xac), the causal agent of citrus (citrus spp.) canker. it also evaluates the methodology used for this species under different electrical parameters. the bacterium used in the study (xac 306) was the same strain used for recent complete sequencing of the organism. the use of a plasmid (pufr047, gentamycinr) is reported here to be able to replicate in cells of xac. following the preparation and resuspension of competent cells of xac at a density of ~4 x 1010 cfu/ml, in 10% glycerol, and the addition of the replicative plasmid, an electrical pulse was applied to each treatment. selection of transformants showed a high efficiency of transformation (1.1 x 106 transformants/mg dna), which indicates an effective, and inverse, combination between electrical resistance (50 w) and capacitance (50 μf) for this species, with an electrical field strength of 12.5 kv.cm-1 and 2.7-ms pulse duration. besides the description of a method for electroporation of xac 306, this study provides additional information for the use of the technique on studies for production of mutants of this species.
Diversidade genética de porta-enxertos cítricos baseada em marcadores moleculares RAPD
Sch?fer, Gilmar;Bastianel, Marinês;Dornelles, Ana Lúcia Cunha;
Ciência Rural , 2004, DOI: 10.1590/S0103-84782004000500017
Abstract: this research intended to characterize the genetic diversity of citrus rootstocks from the experimental agronomic station of the rio grande do sul federal university (eea/ufrgs) and rootstocks collected in nurseries of the cai river valley - rio grande do sul - brazil. the method used was the random amplification of polymorphic dna (rapd) markers. leaves of nine citrus rootstocks from eea/ufrgs and ten accesses of trifoliate orange (poncirus trifoliata) from different nurseries were collected. with the use of nine random primers it was possible to separate the rootstocks in two main groups: one formed by ?rangpur? lime (citrus limonia) and the other by trifoliate orange and its hybrids of low genetic similarity. rapd molecular marker was very efficient for the citrus rootstock characterization and for the trifoliate orange separation from its hybrids. the technique might be used to characterize cultivars, analysis of genetic variability among progenitors in improvement breeding programs of rootstock , and identify zygotic seedlings of trifoliate orange in commercial nurseries.
Porta-enxertos para a lima-ácida-'Tahiti' na regi?o de Bebedouro, SP
FIGUEIREDO, JOSé ORLANDO DE;STUCHI, EDUARDO SANCHES;DONADIO, LUIZ CARLOS;TEóFILO SOBRINHO, JOAQUIM;LARANJEIRA, FRANCISCO FERRAZ;PIO, ROSE MARY;SEMPIONATO, OTáVIO RICARDO;
Revista Brasileira de Fruticultura , 2002, DOI: 10.1590/S0100-29452002000100034
Abstract: in 1988 an experiment was established in bebedouro, sp (brazil), in order to evaluate eleven rootstocks for 'tahiti' lime (citrus latifolia tanaka). scion variety was the iac 5 cultivar, from iac germplasm bank at cordeirópolis, sp; all rootstocks were also obtained at that institution. a randomized blocks design was used as statistical model, with eleven blocks and one plant per treatment. the eleven treatments were: 'sunki' (citrus sunki hort. ex tanaka), 'cleópatra'(citrus reshni hort. ex tan.), 'batangas' and 'oneco' (citrus reticulata blanco) mandarins; eel trifoliate (poncirus trifoliata raf.); rangpur lime (citrus limonia osbeck); 'catania 2 volkamer' lemon (citrus volkameriana tan. & pasq.); 'orlando' tangelo (c. reticulata blanco x c. paradisi macf.); 'swingle' citrumelo (p. trifoliata raf. x citrus paradisi macf.); 'morton' citrange (p. trifoliata raf. x c. sinensis (l.) osbeck) and 'caipira dac' sweet orange (c. sinensis (l.) osbeck). yield was evaluated annually from 1991 to 1998; drought resistance was evaluated in 1991, 1994 and 1995; fruit features were assessed in 1997 and canopy height and diameter were measured in 2000. highest mean yields were associated to 'orlando' tangelo, 'morton' citrange and 'swingle' citrumelo rootstocks. the lowest yields were related to mandarins and 'caipira dac' sweet orange. plants with 'rangpur' lime as rootstock bore intermediate yields and their productive life was short.
Produtividade e qualidade dos frutos da laranjeira 'Pêra' clone IAC em 16 porta-enxertos na regi?o de Bebedouro-SP
Stuchi, Eduardo Sanches;Donadio, Luiz Carlos;Sempionato, Otávio Ricardo;Perecin, Dilermando;
Revista Brasileira de Fruticultura , 2004, DOI: 10.1590/S0100-29452004000200044
Abstract: an experiment was set up in july 1993, at bebedouro city, s?o paulo state, brazil, aiming to evaluate the rootstock influence on the yield and several physical and chemical fruit characteristics such as fruit size, total soluble solids, acidity, ratio juice content and technological index of 'pera' iac sweet orange [citrus sinensis (l.) osbeck], in a high inoculum pressure area of citrus variegated chlorosis (cvc). the spacement was 6.0 m between rows and 3.5 m between trees. the experimental design used was randomized blocks, with three replications and two trees per plot. the rootstocks tested were 'sun chu sha kat' mandarin (citrus reticulata), 'pectinífera' (c. reticulata), 'shekwasha' (c. depressa hayata), 'pectinífera/shekwasha' (c. depressa hayata), 'batangas' (c. reticulata), 'oneco' (c. reticulata), citrangor [citrange (poncirus trifoliata raf. x c. sinensis) x c. sinensis], citrandarin (c. sunki hort. ex tanaka x poncirus trifoliata l. raf. cv. english), 'sunki' (c. sunki), 'suen-kat' (c. sunki), nasnaran (c. amblycarpa ochse), 'venezuela' mandarin (c. reticulata), 'heen naran' mandarin (c. lycopersicaeformis), 'cravo' (c. limonia osbeck) x 'cleopatra' (c. reshni hort ex tanaka), 'cravo' (c. limonia), 'cleopatra' (c. reshni). cvc intensity was different due to rootstocks effects and not related with yield until the fourth year of production. with the exception of the nasnaran mandarin the rootstocks induced initial fruit production and quality similar to 'cravo'.
ESTAQUIA SEMI-LENHOSA: UM MéTODO RáPIDO E ALTERNATIVO PARA A PRODU??O DE MUDAS DE LIMA áCIDA 'TAHITI'
Prati, Patricia;Mour?o Filho, Francisco de Assis Alves;Dias, Carlos Tadeu dos Santos;Scarpare Filho, Jo?o Alexio;
Scientia Agricola , 1999, DOI: 10.1590/S0103-90161999000100025
Abstract: the effect of various concentrations and exposure times of two plant growth regulators on root formation of stem cuttings of `tahiti' lime (citrus latifolia tanaka) was evaluated. additional trials evaluated and compared root formation efficiency of stem cuttings of two sweet orange cultivars (citrus sinensis l. osbeck). the research was carried out in piracicaba, sp, brazil, in an screen-house with an intermitent water spray system, using 10 cm long, five month old terminal semihardwood stem cuttings, without the three basal leaves. the experimental design consisted of randomized blocks, with four replications in all trials. data was collected 90 days after the beginning of each trial. the parameters analysed were: average number of roots per rooted cutting, percentage of rooting, percentage of callus induction, average length of the longest root, and average number of leaves per rooted cutting. the results showed that: a) rooting of `tahiti' lime cuttings was high, above 50%, reaching up to 96% in some cases, with no effect of the application of any plant growth regulator; b) sweet orange cuttings presented low percentage of root formation (around 0,5%), with no effect of the application of any plant growth regulator; c) there were no significant differences among the treatments for all the other parameters; d) the present study showed that plant propagation of `tahiti' lime through stem cuttings is an efficient and fast propagation method for this citrus species.
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