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Deporaus marginatus, commonly known as the mango leaf-cutting weevil, [1] is a species of leaf weevil in the beetle family Attelabidae. [ 2 ] [ 3 ] It is a light tan colour with black elytra (wing cases), [ 4 ] and is found in tropical Asia where it is a pest of mango ( Mangifera indica ).
If the white outer growth is removed or disturbed, the disease appears as purple-brown blotches on older leaves and fruit. [2] [12] Infection may also cause distortion of young leaves, as the infection usually begins on the underside of the leaf. [12] Necrotic lesions appear on the upper side of the leaf, and the leaves tend to curl downward. [7]
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.
All oak trees may display foliage marcescence, even species that are known to fully drop leaves when the tree is mature. [7] Marcescent leaves of pin oak (Quercus palustris) complete development of their abscission layer in the spring. [8] The base of the petiole remains alive over the winter. Many other trees may have marcescent leaves in ...
Columnist Bill Lamont noticed that some of his trees looked like October foliage in August.
Autumn leaf color is a phenomenon that affects the normally green leaves of many deciduous trees and shrubs by which they take on, during a few weeks in the autumn season, various shades of yellow, orange, red, purple, and brown. [1]
The mango trees on his Homestead farm usually provide enough fruit for the whole year, up to 1,000 pounds. This year, he notes, “there were about 10 mangoes on the trees.”
The mango mealybug (Drosicha mangiferae) is a pest of mango crops in Asia. The nymphs and females suck plant sap from inflorescences, tender leaves, shoots and fruit peduncles. [ 2 ] As a result, the infested inflorescences dry up, affects the fruit set, causing fruit drop.