DSpace Collection:http://repositoriodigital.ipn.mx/handle/123456789/7252024-03-29T12:04:57Z2024-03-29T12:04:57ZProducción de Lecanicillium (= Verticillium) lecanii en diferentes sustratos y patogenicidadCortez Madrigal, Hipólitohttp://repositoriodigital.ipn.mx/handle/123456789/77892012-10-19T19:32:37Z2007-01-01T00:00:00ZTitle: Producción de Lecanicillium (= Verticillium) lecanii en diferentes sustratos y patogenicidad
Authors: Cortez Madrigal, Hipólito
Abstract: The conidial production of the fungus Lecanicillium lecanii cultivated in different substrates (nutrition media + supports) and its pathogenicity were determined. The evaluated media were: sorghum, rice grain, broken rice grain (“granillo”), rice polish (“pulido”) and as supports sugar cane leftover “bagazo”, rice husk and corn cob “olote”. The combination of media and supports provided twelve treatments plus a control constituted by rice alone. The production of conidia displayed statistical differences (p≤ 0.05) among treatments; those with larger conidia production were sugar cane leftover (bagazo) + rice (839.7 ± 1.2 x 106 g-1) and sorghum + corn cob (825.8 ± 1.7 x 106 g-1). Although polished of rice was the less efficient medium for production, all combinations where it was included resulted superior to rice alone. Rice showed the smallest production of conidia (265.4 ±1 x 106 g-1). Also, the media and support where it was produced affected the pathogenicity of L. lecanii on Toxoptera aurantii and Aphis gossypii. The aeration favored by the support marked the difference between treatments and the control. Results indicated that the culture medium is important for the massive production of L. lecanii; besides, they indicate that the pathogenicity of the fungus was also affected by the culture medium.2007-01-01T00:00:00ZOcurrencia de hongos y etiología de la secadera de la fresa con diferentes sistemas de manejo agronómicoCejaTorres, Luis F.Mora Aguilera, GustavoTéliz, DanielMora Aguilera, AntonioSánchez García, PrometeoMuñoz Ruíz, CarlosTlapal Bolaños, BerthaDe La Torre Almaraz, Rodolfohttp://repositoriodigital.ipn.mx/handle/123456789/77882019-10-02T16:55:28Z2008-01-01T00:00:00ZTitle: Ocurrencia de hongos y etiología de la secadera de la fresa con diferentes sistemas de manejo agronómico
Authors: CejaTorres, Luis F.; Mora Aguilera, Gustavo; Téliz, Daniel; Mora Aguilera, Antonio; Sánchez García, Prometeo; Muñoz Ruíz, Carlos; Tlapal Bolaños, Bertha; De La Torre Almaraz, Rodolfo
Abstract: In México, strawberry dry wilt (Fragaria x ananassa) has been associated with a fungus complex in which only the implication of Fusarium oxysporum (Fox) is evident. Therefore, in the present study the association of fungi and pseudofungi with the disease was determined in different systems of agronomical management, and pathogenicity was verified. Two samplings were made in the 2002/03 season and three in 2003/04 in 16 localities of the Valley of Zamora, Michoacán, México, where 2640 sections of roots and 365 of necrotic crowns were sown, along with 400 sections of asymptomatic tissue in potato-dextrose-agar (PDA) culture medium and a selective medium with antibiotics and PCNB (PARPH) fungicide. Fox, F. solani (Fso), Cylindrocarpon sp. (Cyl), Pythium aphanidermatum (Pyt), Phytophthora sp. (Phy), Rhizoctonia fragariae (Rhi), Verticillium albo-atrum (Ver) and Colletotrichum sp. (Col) were associated with the dry wilt. Fox was the most frequent species (p=0.05) and the only one that showed an increase from flowering to fructification of 47 to 62% in root and 77 to 83% in crown. In plantations with plastic mulch and drip irrigation (A + G), Fox decreased by 18% with respect to unmulched soil with gravity irrigation, whereas Cyl increased by 15% in A + G (p=0.05). The clay and clay loam soil contrasted in the detection of Fox (46.8 and 12.4%) and Rhi (9.1 and 43.7%). Symptoms of wilting with necrosis in root and crown and general death were reproduced with individual inoculations of Fox (100%), Pyt (100%), Phy (100%), Rhi (60%) and combinations of Fox with Rhi (100%), Pyt (100%) and Cyl (100%). This is the first report that implies Phytophthora sp., P. aphanidermatum and R. fragariae as causal pathogens of dry wilt in México. The morphological identification of Fox and Rhi was confirmed by sequencing of the intergenic region of the rDNA.2008-01-01T00:00:00ZPrimer registro de Lecanoideus floccissimus (Hemiptera: Aleyrodidae) en cacao de Tabasco, MéxicoCortéz Madrigal, HipólitoMartínez López, María CruzReyes Izquierdo, FranciscoOrtega Arenas, Laura Deliahttp://repositoriodigital.ipn.mx/handle/123456789/77872019-10-02T16:48:37Z2008-01-01T00:00:00ZTitle: Primer registro de Lecanoideus floccissimus (Hemiptera: Aleyrodidae) en cacao de Tabasco, México
Authors: Cortéz Madrigal, Hipólito; Martínez López, María Cruz; Reyes Izquierdo, Francisco; Ortega Arenas, Laura Delia
Abstract: The whitefly Lecanoideus floccissimus is reported for the first time from material collected in Tabasco, Mexico. Furthermore, to identify the biotic and abiotic factors that regulate its populations and the causes that induce their increase in cocoa crops, periodic sampling was conducted during 2004 in two plantations under different conditions. One was located in Mantilla, Cunduacan, > 35 years old, with scarce canopy and surrounded by cocoa plantations. The other plantation was located in Habanero, Cárdenas, approximately 15 years old, abundant canopy and isolated from cocoa plantations. Through direct sampling and yellow traps, the incidence of the pest (percentage of infested trees), population abundance and natural enemies were determined. The effect of temperature and precipitation on pest incidence was evaluated. L. floccissimus was present all year round. In the old plantation, incidence was higher (72.31 ± 21.81%) than the young plantation (26.39 ± 13.17%). The opposite occurred in insect populations: the highest levels were recorded in the young plantation and the lowest in the old plantation. The main natural enemies were the predator Ceraeochrysa sp. and parasitoids of the family Aphelinidae; the greatest activity of the entomophages was on eggs and early instars. Of the abiotic factors, only temperature was correlated with the pest (r = 0.76-0.77). The rapid proliferation of L. floccissimus in cocoa crops in Tabasco could be explained by the age of cocoa plantations (> 35 years), as well as the low diversity and activity of natural enemies.2008-01-01T00:00:00ZUna especie nueva de Pachyphytum (Crassulaceae) para la flora de Jalisco, MéxicoPérez Calix, EmmanuelGarcía Ruiz, IgnacioCházaro Basáñez, Miguelhttp://repositoriodigital.ipn.mx/handle/123456789/77862019-10-02T16:51:46Z2008-01-01T00:00:00ZTitle: Una especie nueva de Pachyphytum (Crassulaceae) para la flora de Jalisco, México
Authors: Pérez Calix, Emmanuel; García Ruiz, Ignacio; Cházaro Basáñez, Miguel
Abstract: Pachyphytum contrerasii (Crassulaceae) is proposed and described here as a new species from central Jalisco, western Mexico. This taxon belongs to the section Pachyphytum Moran, on account of its imbricate bracts of the young cincinnus, of its corolla shorter than the calyx and of its the conspicuous red dot on the inner face of the corolla segments. In terms of morphology and geography the closest relative is Pachyphytum machucae I. Garcia, Glass & Cházaro, from northwestern Michoacan, In addition to its geographical distribution, Pachyphytum contrerasii is separated from this species by the possession of pedicels 2-4 mm long, a corolla 3 mm long that is shorter than the pair of larger sepals, and bicolored inner face of the petals, stamens and pistil. Besides being a new species this is the first report of the genus Pachyphytum for Jalisco state.2008-01-01T00:00:00Z