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Keyword: Leaves |
Overview - a b c d e f g h i j k l m n o p q r s t u v w x y z |
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| Willow flea beetle | ... are their preferred habitats. They can also be encountered in natural gardens and parks.
The willow flea beetle is active during the day from May-October (after overwintering). During this time it is mainly seen on willows and poplars, whose leaves it eats. The willow flea beetle nibbles roundish holes into the leaves.
At age 7-8 months, the willow flea beetle is sexually mature. In June/August the beetles mate. The fertilized females lay their eggs on the leaves of the forage plants of their larvae. The eggs are yellowish and spindle-shaped.
The larvae hatch in summer. They are 5-6 mm long, black and resemble a small slug. The larvae live sociably on the same host plants (such as willow and poplar tree...
...The larvae hatch in summer. They are 5-6 mm long, black and resemble a small slug. The larvae live sociably on the same host plants (such as willow and poplar trees of the genus Salix or genus Populus) just like the adult beetles and often eat the leaves with the venes of the leaves remaining only. In late summer, the three-month development from egg to adult beetle is complete. The adult beetles overwinter under piles of leaves or in other protected places near the ground.
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| ...f about 1 week and only feed on vegetables (phytophagous). Aside from the open air, they are mainly encountered in greenhouses. After hatching from pupae, the females start feeding immediately. They drill small holes in the top surface of plants’ leaves using their ovipositors and suck up liquid with their mouth parts. The damaged areas on the leaf tissue (which also enable bacteria and fungi to penetrate into the plant) are clearly visible as yellowish stains.
The males live on nectar or hon...
...their eggs on the food plants of the larvae, for example chrysanthemums (hence their name) and gerberas.
In vegetable plantations, chilli plants and potatoes are often affected. The females use their ovipositors to drill into the upper side of leaves and place 50 to 100 (sometimes even up to 400) eggs there. The hatched larvae develop rapidly. At the end of the third and last larval stage the bodies of the larvae can reach lengths of up to 3 mm. The bodies are yellowish-white in colour and h...
... The larvae remain in the leaf and bite twisting (serpentine like) passageways into the cell tissues by moving their mouth hooks up and down. Hence the English name "Serpentine leafminers" for the genus Liriomyza. The outer layer of the leaves remains intact.
After 4 days the larvae are fully developed and leave the leaves’ interior, through a slit, in order to pupate. The development from egg to pupae (reddish-yellow to brown in colour) to adult takes about 17 days.
Endoparasites are natural enemies of the Chrysanthemum leaf miner larvae, for example, the larvae ... | | |
| | The andromeda lace bug is only seen in daytime and feeds on plants (phytophagous). As it is not inclined to move much , it is mainly found on the undersides of the leaves of the host plants. It sucks fluid from the leaves’ cells , which causes the leaves to yellow and eventually fall off. Thus the whole plant loses its leaves from top to bottom . Often the host plants die. Some examples of the plants which the andromeda lace bug prefers to eat are : heather species (Ericaceae), Illiciaceae, rhododendron and azalea (rhododendron spp.) as well as some plants of the famil... | | |
| | The females lay their eggs singly, in clusters or in rows on their forage crops. Some species hide their eggs in holes in leaves, stems or twigs. Others cover their eggs with feces. The Donaciinae live both on water as well as on water plants. Here is the egg laying in a kind of jelly. The eggs are laid in rows on leaves. The larvae bore their heads in roots, stems or leaves and suck out the plant juices. | | |
| | The larvae of rose leafhoppers are cream coloured. Rose leafhoppers and their larvae pierce the leaf tissue and suck plant juices from the underside of rose petals. The rose plants initially show a fine, white and yellow mottling on the leaves. Rose leafhoppers usually start sucking along the leaf veins and later spread out onto the whole leaf. After a while the leaves of infected plants are densely dotted with numerous pale stains and they then wither and fall off. Similar damage is caused by spider mites. For spider mite infestation, the evidence is the lack of Rose leafhopper and their missing larvae on the leaves’ undersides. | | |
| | ... stage they are about 11 mm in length and pupate. The larvae of alder leaf beetles are first olive, later cyan and shortly before pupating bluish in colour. They have 2 rows of very hairy warts. The larvae, like the adult beetles, feed on the leaves of the grey or speckled alder (Alnus incana), hornbeam (Carpinus), birch (Betula) and hazel (Corylus). They feed, initally in groups and later alone, by scraping the surface off the leaves from the underside, leaving only the veins, unlike the adults. eats the leaves from the lower surface by scraping them off. The development of the larvae is complete in 3 weeks (June/July). They pupate in oval spaces in the earth just beneath the surface of the soil, where they remain for 8 to 11 days. In August the b... | | |
| | By spring or early summer, Rhopalus subrufus have reached sexual maturity and mate. The fertilized females lay their eggs on the underside of the leaves of the preferred food plants of the larvae. The larvae feed on these leaves for about 4 to 5 weeks after hatching (usually in the month of August);later they feed on the fruit. Theygo through 5 stages of development up to autumn time. Rhopalus subrufus overwinter in frost free places in the soil or under leaves. | | |
| | The larvae resemble caterpillars. They have segmented legs attached to the chest and 6 to 8 pairs of hind legs. They have two simple eyes. The larvae feed on the leaves or the fruit of various trees, shrubs and herbaceous plants. They often appear in groups on leaves which they eat from outside in. They often “ride” on the leaves’edges while eating and - raise up their abdomen when disturbed. | | |
| | Lagriinae | | ...rldwide. The most commonly occurring subspecies in Germany is Lagria hirta.
The adult beetles have body lengths of 7 to 12 mm. The wing covers are brownishred in colour and have a fine hair, which looks like brown wool.
Lagriinae eat young leaves of flowering plants. They are encountered on grasses, herbs and shrubs. The adults fly throughout the summer. The larvae of Lagriinae are white and brownish in colour. They are very small and survive the winter on fallen leaves, which are also their food source. The larvae turn to pupae in the soil. | | |
| | Common flower bugs mate in late summer to autumn. The females overwinter under bark, leaves or grass tussocks. From March on, they leave their hideouts and start hunting small insects. After mating, the fertilized females lay their eggs on the underside of leaves. The larvae hatch later and develop to maturity from May to June. The larvae of the 2nd generation develop within 8 weeks and are mature from September on.
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