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Uroleucon formosanumgreen vegetable pest
The common interest among people who have a vegetable garden or a small farm is to choose a plant which does not need chemical pesticide because it is difficult to buy only small amount of chemical pesticide and they do not want to use chemical one because they are going to eat them. Therefore, their favorite vegetables are lettuce and Chinese cabbage. Unlike radish, pest appears less on them. Nevertheless, there are several insects appear on lettuce; aphids, mulberry trips, stinkbug and cucullia fraterna. Therefore, it is important to choose the best season to plant to avoid those insects. If there is wild grass like Korean lettuce or thistle around your garden,  you should cut them all. Even natural pesticide is difficult to get with small amount. Therefore, I recommend you to make a direct dealing with farmers who make natural pesticide or have one.
 
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a non-winged uroleucon formosanum adult
Uroleucon formosanum
Hemiptera aphids
 
О Scientific name : Uroleucon formosanum (Takahashi)
О Size : The length of winged one's body is around 3mm and non-winged one is around              3.8mm .
О Host : lettuce, Korean lettuce, thistle and more
О Distribution : Korea, Japan, China, Taiwan and more
 
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two non-winged uroleucon formosanum adults 
Both winged and non-winged insects' color of body is brown. The winged insect has a bump on its forehead and there are 3 to 4 bristles which is headed backward. Its feelers are 6 joints and the 3rd joint is the longest one. The length of the 3rd joint is the same with combined length of the 4th and the 5th joints. Moreover, you can distinguish with other species because there is around 130 of 2nd sensillums on its feelers.
 
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Uroleucon formosanum nymph 
+ its head and backside is red and middle of its body starts to turn brown
There is patterns on its side of belly and has clear ante-siphuncular sclerite and post-siphuncular sclerite. There is skin slough on Its abdominal tergum and there is a bristle every joints. The length of the insect's siphunculus is 0.8 mm and cylindrical. Moreover, its spihunculus taper and there is net pattern one third end of it. The length of its end carve is around 0.5 mm. Basal part is slimmer and sharp at the end. There is around 18 bristles.
 
The non winged one has around 80 of the 2nd sensillum on the 3rd sense joint and there is shank in the middle of chest inner bone. There is no patterns on side of its belly. Its ante-siphuncular sclerite is thin but its post-siphuncular sclerite is thick. There are 2, 6, and 4 skin sloughs and one bristle each on 6th, 7th and 8th belly joint. Its backside is thin and there are around 16 long bristles. 
 
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Uroleucon formosanum appeared behind of a leaf
It stays all together on the backside of leaf and suck its juice. Moreover, cucumber mosaic is carried by Uroleucon formosanum. The similar species of uroleucon formosanum is Uroleucon lactucicola. 
Photo by Teokgi Park
Translated by Sunyoung Cho

Other articles by Teokgi ParkInterviewed on : 2016.11.04 23:23

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#insect#hemiptera#homoptera#aphids#uroleucon#uroleucon formosanum#lettuce#Korean lettuce

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