|
Leaf Curl
Peach leaf curl is a plant disease characterized by distortion and coloration of leaves and is caused by the fungus '' Taphrina deformans'', which infects peach, nectarine, and almond trees. ''T. deformans'' is found in the United States, Europe, Asia, Africa, Australia, and New Zealand. Peach leaf curl reduces the amount of leaves and fruit produced by peach and nectarine trees. Affected species Peach leaf curl mainly affects peach, nectarine, and almond trees. Apricots are generally immune to peach leaf curl (instead, the major apricot diseases are blossom wilt and branch dieback caused by '' Monilinia fructicola'' in the spring and '' Eutypa lata'' in the summer). However, in an isolated case in Hungary in 2011, peach leaf curl was also identified in apricot trees. Symptoms Peach leaf curl is a distinctive and easily noticeable fungal disease, and the severity of the symptoms depends on how early infection has occurred. Diseased leaves can usually be identified soon afte ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Solanaceae
Solanaceae (), commonly known as the nightshades, is a family of flowering plants in the order Solanales. It contains approximately 2,700 species, several of which are used as agricultural crops, medicinal plants, and ornamental plants. Many members of the family have high alkaloid contents, making some highly toxic, but many—such as tomatoes, potatoes, eggplants, and peppers—are commonly used in food. Originating in South America, Solanaceae now inhabits every continent on Earth except Antarctica. After the K—Pg extinction event they rapidly diversified and have adapted to live in deserts, tundras, rainforests, plains, and highlands, and taken on wide range of forms including trees, vines, shrubs, and epiphytes. Nearly 80% of all nightshades are included in the subfamily Solanoideae, most of which are members of the type genus ''Solanum''. Most taxonomists recognize six other subfamilies: Cestroideae, Goetzeoideae, Nicotianoideae, Petunioideae, Schizanthoideae, an ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apricot
An apricot (, ) is a fruit, or the tree that bears the fruit, of several species in the genus ''Prunus''. Usually an apricot is from the species '' P. armeniaca'', but the fruits of the other species in ''Prunus'' sect. ''Armeniaca'' are also called apricots. In 2022, world production of apricots was 3.9 million tonnes, led by Turkey with 21% of the total. Etymology ''Apricot'' first appeared in English in the 16th century as ''abrecock'' from the Middle French or later , from Spanish '' albaricoque'' and Catalan , in turn from Arabic (, ), from Byzantine Greek (, ), derived from late Greek (, ) from Latin () (, ). Description The apricot is a small tree, tall, with a trunk up to in diameter and a dense, spreading canopy. The leaves are ovate, long, and wide, with a rounded base, a pointed tip, and a finely serrated margin. The flowers are in diameter, with five white to pinkish petals; they are produced singly or in pairs in early spring before the leaves. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Viral Plant Pathogens And Diseases
The word ''Viral'' means "relating to viruses" (small infectious agents). It may also refer to: Viral behavior, or virality Memetic behavior likened that of a virus, for example: * Viral marketing, the use of existing social networks to spread a marketing message * Viral phenomenon, relating to contagion theory or the "virality" of network culture, such as a meme * Viral video Viral videos are video, videos that become popular through viral phenomenon, a viral process of Internet sharing, primarily through video sharing websites such as YouTube as well as social media and email.Lu Jiang, Yajie Miao, Yi Yang, ZhenZhon ..., a video that quickly attains a high popularity Titled works * Viral (2016 American film), ''Viral'' (2016 American film), a 2016 American science fiction horror drama * Viral (2016 Hindi film), ''Viral'' (2016 Hindi film), an Indian Bollywood film based on social media * Viral (upcoming film), ''Viral'' (upcoming film), an American psychological thri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fungal Tree Pathogens And Diseases
A fungus (: fungi , , , or ; or funguses) is any member of the group of eukaryotic organisms that includes microorganisms such as yeasts and molds, as well as the more familiar mushrooms. These organisms are classified as one of the traditional eukaryotic kingdoms, along with Animalia, Plantae, and either Protista or Protozoa and Chromista. A characteristic that places fungi in a different kingdom from plants, bacteria, and some protists is chitin in their cell walls. Fungi, like animals, are heterotrophs; they acquire their food by absorbing dissolved molecules, typically by secreting digestive enzymes into their environment. Fungi do not photosynthesize. Growth is their means of motility, mobility, except for spores (a few of which are flagellated), which may travel through the air or water. Fungi are the principal decomposers in ecological systems. These and other differences place fungi in a single group of related organisms, named the ''Eumycota'' (''true fungi'' or ' ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lime Sulphur
In horticulture, lime sulfur (lime sulphur in British English, see American and British English spelling differences) is mainly a mixture of calcium polysulfides and thiosulfate (plus other reaction by-products as sulfite and sulfate) formed by reacting calcium hydroxide with elemental sulfur, used in pest control. It can be prepared by boiling in water a suspension of poorly soluble calcium hydroxide (lime) and solid sulfur together with a small amount of surfactant to facilitate the dispersion of these solids in water. After elimination of residual solids (flocculation, decantation, and filtration), it is normally used as an aqueous solution, which is reddish-yellow in colour and has a distinctive offensive odor of hydrogen sulfide (H2S, rotten eggs). Synthesis reaction The exact chemical reaction leading to the synthesis of lime sulfur is generally written as: : as reported in a document of the US Department of Agriculture (USDA). This vague reaction is poorly understood, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bordeaux Mixture
Bordeaux mixture (also called ''Bordo Mix'') is a mixture of copper(II) sulphate (CuSO4) and quicklime ( Ca O) used as a fungicide. It is used in vineyards, fruit-farms, vegetable-farms and gardens to prevent infestations of downy mildew, powdery mildew and other fungi. It is sprayed on plants as a preventive treatment; its mode of action is ineffective after a fungus has become established. It was invented in the Bordeaux region of France in the late 19th century. If it is applied in large quantities annually for many years, the copper in the mixture eventually becomes a pollutant. As such its use is controlled, but not forbidden in most of the European Union. Despite this, some advocates of organic gardening consider it an ' organic' pesticide. Main uses In addition to its use to control fungal infection on grape vines, the mixture is also widely used to control potato blight, peach leaf curl and apple scab. Although it may be bad for the environment,Pears, Pauline, et al. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Conidium
A conidium ( ; : conidia), sometimes termed an asexual chlamydospore or chlamydoconidium (: chlamydoconidia), is an Asexual reproduction, asexual, non-motility, motile spore of a fungus. The word ''conidium'' comes from the Ancient Greek word for dust, ('). They are also called mitospores due to the way they are generated through the cellular process of mitosis. They are produced exogenously. The two new haploid cells are genetically identical to the haploid parent, and can develop into new organisms if conditions are favorable, and serve in biological dispersal. Asexual reproduction in ascomycetes (the phylum Ascomycota) is by the formation of conidia, which are borne on specialized stalks called conidiophores. The Morphology (biology), morphology of these specialized conidiophores is often distinctive between species and, before the development of molecular techniques at the end of the 20th century, was widely used for identification of (''e.g.'' ''Metarhizium#Species, Metarh ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascospore
In fungi, an ascospore is the sexual spore formed inside an ascus—the sac-like cell that defines the division Ascomycota, the largest and most diverse Division (botany), division of fungi. After two parental cell nucleus, nuclei fuse, the ascus undergoes meiosis (halving of genetic material) followed by a mitosis (cell division), ordinarily producing eight genetically distinct haploid spores; most yeasts stop at four ascospores, whereas some moulds carry out extra post-meiotic divisions to yield dozens. Many asci build turgor, internal pressure and shoot their spores clear of the calm boundary layer, thin layer of still air enveloping the fruit body, whereas subterranean truffles depend on animals for biological dispersal, dispersal. Ontogeny, Development shapes both form and endurance of ascospores. A hook-shaped crozier aligns the paired nuclei; a double-biological membrane, membrane system then parcels each daughter nucleus, and successive wall layers of β-glucan, chitosan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cuticle
A cuticle (), or cuticula, is any of a variety of tough but flexible, non-mineral outer coverings of an organism, or parts of an organism, that provide protection. Various types of "cuticle" are non- homologous, differing in their origin, structure, function, and chemical composition. Human anatomy In human anatomy, "cuticle" can refer to several structures, but it is used in general parlance, and even by medical professionals, to refer to the thickened layer of skin surrounding fingernails and toenails (the eponychium), and to refer to the superficial layer of overlapping cells covering the hair shaft ( cuticula pili), consisting of dead cells, that locks the hair into its follicle. It can also be used as a synonym for the epidermis, the outer layer of skin. Cuticle of invertebrates In zoology, the invertebrate cuticle or cuticula is a multi-layered structure outside the epidermis of many invertebrates, notably arthropods and roundworms, in which it forms an exoskeleton ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ascus
An ascus (; : asci) is the sexual spore-bearing cell produced in ascomycete fungi. Each ascus usually contains eight ascospores (or octad), produced by meiosis followed, in most species, by a mitotic cell division. However, asci in some genera or species can occur in numbers of one (e.g. '' Monosporascus cannonballus''), two, four, or multiples of four. In a few cases, the ascospores can bud off conidia that may fill the asci (e.g. '' Tympanis'') with hundreds of conidia, or the ascospores may fragment, e.g. some '' Cordyceps'', also filling the asci with smaller cells. Ascospores are nonmotile, usually single celled, but not infrequently may be coenocytic (lacking a septum), and in some cases coenocytic in multiple planes. Mitotic divisions within the developing spores populate each resulting cell in septate ascospores with nuclei. The term ocular chamber, or oculus, refers to the epiplasm (the portion of cytoplasm not used in ascospore formation) that is surrounded by the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Apricot
An apricot (, ) is a fruit, or the tree that bears the fruit, of several species in the genus ''Prunus''. Usually an apricot is from the species '' P. armeniaca'', but the fruits of the other species in ''Prunus'' sect. ''Armeniaca'' are also called apricots. In 2022, world production of apricots was 3.9 million tonnes, led by Turkey with 21% of the total. Etymology ''Apricot'' first appeared in English in the 16th century as ''abrecock'' from the Middle French or later , from Spanish '' albaricoque'' and Catalan , in turn from Arabic (, ), from Byzantine Greek (, ), derived from late Greek (, ) from Latin () (, ). Description The apricot is a small tree, tall, with a trunk up to in diameter and a dense, spreading canopy. The leaves are ovate, long, and wide, with a rounded base, a pointed tip, and a finely serrated margin. The flowers are in diameter, with five white to pinkish petals; they are produced singly or in pairs in early spring before the leaves. T ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Eutypa Lata
''Eutypa lata'' is a fungal plant pathogen of grapevines. The fungus also attacks many other hosts such as cherry trees, most other ''Prunus'' species, as well as apples, pears and walnuts. In apricots, the fungus reveals a canker surrounding a pruning wound. ''Eutypa lata'' was first found in Californian grapevines by English ''et al.''1962, a few years after its discovery elsewhere. Travadon ''et al.'', 2011 finds that ''E. lata'' is an entirely or almost entirely sexual population here but asexual reproduction may be a rare occurrence. It causes 'Eutypa dieback' in New Zealand grapevines as well. The fungus was difficult to identify on the basis of colony morphology and could be out-competed by other fungi when isolated from wood. DNA Deoxyribonucleic acid (; DNA) is a polymer composed of two polynucleotide chains that coil around each other to form a double helix. The polymer carries genetic instructions for the development, functioning, growth and reproduction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
