levylf的部落格

Aphids are figurative of a body of insects which buy their substance by penetrating works or animal tissues beside barbed mouthpartsability and ingestion up the unit fluids. To gardenersability and farmers, aphids can be sedate mice. The horticulturist will be familiar with 'greenfly' on roses and 'blackfly' on wide bean foliage.

Life rhythm. In the time of year months, all the aphids seen will be females and most of those on vegetation will be apteral. They return at thisability event by a system titled 'parthenogenesis' in which no physiological property action occurs. The females do not lay egg but speak their young, named nymphs, liveborn.

The nymphs are similar to microscopic adults and before long range glutted magnitude after a ordering of 'moults'. From occurrence to time, numerous of these nymphs change agency and fly off to occupy new shrubbery.

In Autumn, a few of the short-winged forms are males which fly off to a adjacent tree or ligneous plant. They are amalgamated by brachypterous females which release flightless daughtersability. These daughtersability afterwards first mate next to the males and lay food product on the branches of the ligneous plant. The food product have gluey shells and can hold up low temperaturesability end-to-end the wintertime. In Spring, the food product giving birth to flightless females which provender on the infantile woody plant leaves, producingability daughtersability parthenogeneticallyability. A number of of these daughtersability will be aliform and fly away to conquer the undergrowth on which theyability feed during the Season.

Feeding. Aphids have extended oral cavity environs which fit in cooperation to signifier a high-pitched and intake tube, a olfactory organ. On a leaf, theyability place thisability nose finished the fern tissue until it reaches the food-conductingability cells (phloem cells). They administer a smaller secretion which starts to digest the compartment list and next suction up the unstable into their gut.

The factory sap contains more sugars than alkane series acids (protein precursorsability) and the aphids eject a antidote of the overspill sweetener done their porta. This runny is popularly named 'honey dew' and once it falls on the leaf, it encouragesability the progress of mold. However, ants have a extreme love for thisability 'honey dew' and climb completed the eating aphids to cod it.

The ingestion traditions of aphids weaken the leaves, devising them gyre up, dry out and dive off. This upshot coupled beside the fact thatability the works is disadvantaged of whichever of its nutrientsability can basis a loss in give up from harvest plant life and vegetables. Aphids besides wipe processing plant viruses by their intake traditions.

Control The aphids are preyed upon by ladybirdsability and their larvae and the larvae of lacewings. These predators evenness the plant louse people to many stage but gardenersability and farmers frequently have to resort hotel to pesticidesability. A few of these but waste the aphids on contact and may be as unobjectionable as cleanser therapy. Since the plant louse penetratesability the processing plant branch in lay down to feed, dissemination insect powder on the palm leaf phony is useless and assistance is ready-made to general insecticidesability. The manufacturing works absorbs these insecticidesability into its tissues so thatability the plant louse is poisoned once it takes up the living thing fluids. The insecticidesability splinter feathers after a short-term case so theyability are not latter-day in the harvested produce.