نتایج جستجو برای: leaf spot

تعداد نتایج: 118971  

Journal: :journal of crop protection 2012
seyed akbar khodaparast vahid taheriyan mahmood zahedi

fungi belonging to the mycosphaerella s. l. are widely distributed all over the world. most taxa cause leaf spot diseases, and have considerable impact on cultivation of many economically important crops. on eucalyptus species, for example, mycosphaerella leaf spots are one of the major diseases responsible for severe damage in most parts of the word especially outside of their native cultivati...

Journal: :Genetics and molecular research : GMR 2009
R A Vieira C A Scapim L M Moterle D J Tessmann T V Conrado A T Amaral Júnior

We estimated general and specific combining abilities and examined resistance to northern leaf blight (Exserohilum turcicum) and to gray leaf spot (Cercospora zeae-maydis) in a set of nine inbred popcorn lines. These inbreds were crossed in a complete diallel scheme without reciprocals, which produced 36 F(1) hybrids. Two experiments with a square lattice design and three replications were cond...

Journal: :journal of crop protection 2015
seyed yusef behrooz mohamad salari mahdi pirnia seyed kazem sabbagh

cercosporoid fungi including the genus cercospora and other morphologically similar genera are associated with leaf spot symptoms on various host plants. in this research three taxa including passalora cucurbiticola (on cucurbita sp.), p. bolleana (on ficus carica), and pseudocercosporella capsellae (on capsella bursa-pastoris, sinapis arvensis) were identified. among these, p. cucurbiticola an...

Journal: :Nature 1946

Journal: :journal of crop protection 0
shubhi avasthi mycology and plant pathology laboratory, school of studies in botany, jiwaji university, gwalior 474011, madhya pradesh, india - department of botany, abhilashi institute of life sciences, mandi-175008 (h.p.), india. ajay gautam faculty of sciences, school of agriculture, abhilashi university, mandi-175028 (h.p.), india. rekha bhadauria mycology and plant pathology laboratory, school of studies in botany, jiwaji university, gwalior 474011, madhya pradesh, india.

this paper deals with the study of a leaf spot disease observed on aloe vera leaves in various nurseries and botanical gardens during the routine surveys of two consecutive years of 2010 and 2011. the symptoms appeared in the form of circular to oval, brown to black, sunken spots on abaxial surface of leaves. the disease was observed only in january to february during the survey. colonieson pda...

2002
L. Jacome P. Lepoivre D. Marin R. Ortiz R. Romero

By the end of the 1980s, black leaf streak disease caused by Mycosphaerella fijiensis was present in all continents where bananas or plantains were grown, although distribution in some regions was limited to a few countries. In this presentation, the spread of the disease during the 1990s in several countries and regions, and the important socio-economic consequences are discussed. From 1990 to...

Journal: :journal of crop protection 2015
manpreet kaur neeraj kumar aggarwal

in the years 2012-14 a series of extensive surveys for natural enemies of parthenium were conducted in haryana. during survey, a leaf spot disease has been regularly reported on congress grass at different parts of the kurukshetra and its adjoining areas.the fungal pathogen was isolated from the affected parts of parthenium leaves and on the basis of cultural, morphological and molecular charac...

2015
Kyung-Sook Han Jong-Han Park Chang-Gi Back Mi-Jeong Park

In 2006~2010, leaf spot symptoms, that is, small, yellow spots that turned into dark brown-to-black lesions surrounded by a yellow halo, were observed on Cymbidium spp. in Gongju, Taean, and Gapyeong in Korea. A Fusarium species was continuously isolated from symptomatic leaves; in pathogenicity testing, isolates caused leaf spot symptoms consisting of sunken, dark brown lesions similar to the ...

2013
M. H. HOSSAIN I. HOSSAIN

A study was undertaken to evaluate effectiveness of foliar spray with 33 plant extracts against leaf spot (Tikka) of groundnut caused by Cercospora arachidicola and Cercosporidium personatum. Bavistin and BAU-Biofungicide were included in the experiment as checks and spray of plain water represented control. Almost all treatments gave considerable reduction in disease incidence and increase in ...

Journal: :کشاورزی (منتشر نمی شود) 0
سید باقر محمودی استادیار پژوهش، مؤسسه تحقیقات اصلاح و تهیه بذر چغندرقند، کرج، تهران حمید شریفی عضو هیأت علمی مرکز تحقیقات کشاورزی و منابع طبیعی صفی آباد، دزفول، خوزستان شهرام خدادادی کارشناس، موسسه تولید بذر الیت چغندرقند، فیروزکوه، تهران

resistance of 16 sugar beet cultivars to cercospora leaf spot was evaluated in ghaemshahr region. the experiment was conducted in a complete block design with six replications and disease severity of cultivars was measured two times. as a winter crop the root yield of cultivars and their disease severity compared under natural cercospora infection in dezfoul area in a complete block design with...

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