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Pyrus calleryana, also known as the Callery pear or Bradford pear, is a species of pear tree native to China and Vietnam, [2] in the family Rosaceae. It is most commonly known for its cultivar 'Bradford' and its offensive odor, widely planted throughout the United States and increasingly regarded as an invasive species .
Over the years, Callery pear (Pyrus calleryana) has become one of the most widely planted ornamental trees in the US. But over that time, it has also become abundantly clear that it is not the ...
Late leaf spot Cercospora minima. Mucor fruit rot Mucor spp. Mucor piriformis. Mycosphaerella leaf spot (ashy leaf spot and fruit spot) Mycosphaerella pyri = Mycosphaerella sentina Septoria pyricola [anamorph] Nectria twig blight (coral spot) Nectria cinnabarina Tubercularia vulgaris [anamorph] Pear scab Venturia pyrina Fusicladium pyrorum ...
The litter-trapping marcescent leaf crowns of Dypsis palms accumulate detritus thereby enhancing their nutrient supply, [24] but in trapping nutrient-rich detritus, palms with marcescent leaf bases are also more likely to allow the germination of epiphytic figs in the marcescent leaves, with the figs possibly subsequently strangling the palms. [25]
Pyrus communis, the common pear, is a species of pear native to central and eastern Europe, and western Asia. [3]It is one of the most important fruits of temperate regions, being the species from which most orchard pear cultivars grown in Europe, North America, and Australia have been developed.
Rosaceae (/ r oʊ ˈ z eɪ s iː. iː,-s i. aɪ,-s i. eɪ /), [5] [6] the rose family, is a family of flowering plants that includes 4,828 known species in 91 genera. [7] [8] [9]The name is derived from the type genus Rosa.
Annual autumn leaf drop in temperate zones is caused by the abscission of the mature leaves from the growth season in response to the approach of cold winter weather. Abscission (from Latin ab- 'away' and scindere 'to cut') is the shedding of various parts of an organism, such as a plant dropping a leaf, fruit, flower, or seed.
A leaf area index (LAI) expresses the leaf area per unit ground or trunk surface area of a plant and is commonly used as an indicator of the growth rate of a plant. LAI is a complex variable that relates not only to the size of the canopy, but also to its density, and the angle at which leaves are oriented in relation to one another and to ...