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Wooly apple aphidfruit tree pest
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Wooly apple aphid stays in a group.
+ the leaf turns into yellow or falls early (early defoliation)
Wooly apple aphid
Hemiptera pemphididae

О Scientific name : Eriosoma lanigerum (Hausmann)
О English name : wooly apple aphid
О Size : its body length is around 1.2~2.6 mm
О Host : apple tree, malus sieboldii, three-lobe crabapple, hawthorn, pear tree,
         elm tree

О Distribution : Korea, Japan, Europe, America and more
 
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a winged wooly apple aphid adult
The body length of a non-winged female wooly apple aphid adult is around 2.1 mm. It is covered with white cotton all over its body. Its head is dark green and has white feelers. Its legs are yellow brown, its belly is red brown and there is cotton on it.  The body length of a winged female wooly apple aphid is around 2.3 mm, when it spreads its wings, it is around 6.3 mm. Its head is black. Its eggs is 0.55 mm and cylindrical but sometime you can find an eggshape one. The body length of stem mother is 0.55 mm and green.
 
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Damages by wooly apple aphids
+ sometimes it appears on the damaged stem, the area where was pruned and on the new bud at the same time.
Wooly apple aphid stays in a group, sucks juice and make a gall. Especially, it damages the area where has cuts, the edge of leafstalk, or cracked stem. It also make a gall on the new bud and make leaves into yellow simultaneously. 
 
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wooly apple aphid
+ this was taken after I removed the wax on the aphid's body.
It appears 10 times a year and stays over the coldest season on the cracked stem or near the root as nymph. From May, it moves up to leaves and branches and grows. It appears most during July and slowly disappear from end of August. Wooly apple aphid adult spawns eggs by parthenogenesis and repeat it. Its nymph does not have excreta which looks like cotton on its back until it grows up.There are two types of a wooly apple aphid adult; winged and non-winged one. Before it becomes an adult, it molts 5 times. 
 
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the early instar of wooly apple aphid nymph
In 1920, Wooly apple aphid was successfully controlled by its predator, wooly apple aphid parasitoid. Recently, organic apple orchards uses this method again.
 
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damages by wooly apple aphids
 
Photo by Teokgi Park
Translated by Sunyoung Cho

Other articles by Teokgi ParkInterviewed on : 2018.03.23 10:36

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#hemiptera#Eriosoma#apple pest#apple tree#pemphididae

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