Hop aphid
| Hop aphid | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name | ||||||||||||
| Phorodon humuli | ||||||||||||
| ( Closet , 1801) |
The hop aphid ( Phorodon humuli ) is a species of aphid that primarily infects the hemp plants hops and hemp , but also other crops.
features
Unwedded
On the Winterwirt the color is light green with a green stripe on the back. On the other hand, on the hops they are almost completely white. They are about 2.1 to 3 mm long, their abdominal tubes are cylindrical.
Winged
Your head and chest are dark brown in color. He has brown, line-shaped drawings on his back and his legs are noticeably longer than those of the wingless.
Way of life
The hop aphid overwinters on the plum , plum or sloe . At the end of March, the ancestral mother hatches there and remains on the tree because she is wingless. From the second generation onwards, a large number of winged animals appear and fly to the hops. There, in turn, eight to ten wingless generations emerge. From September winged females and later winged males form, which fly to the winter host and lay eggs there, mostly between buds and twigs.
Damage
The hop aphid damages the hops in two ways. Firstly, through their sucking activity on the flowers, fruit heads and leaves. Second, through the possible transmission of the hop mosaic virus .
literature
- Heinz Dubnik: Aphids. Species identification-biology-control . Thomas Mann Verlag, Gelsenkirchen-Buer 1992, ISBN 3-7862-0091-2 .
Web links
- http://www.eickelmann.de/Seiten/Hopfen/Wissen/PfSchutz/ZyklusPhorodon.html Development cycle of the hop aphid
Individual evidence
- ↑ Archive link ( Memento of the original from October 20, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Archive link ( Memento of the original from October 20, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
- ↑ Archive link ( Memento of the original from October 20, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
