wpe4.jpg (27284 bytes)

Blue Alfalfa Aphids 

           This year we have seen unusually high numbers of several different aphid species, including Russian olive thistle aphid, bird cherry oat aphid, greenbug, green peach aphid, and now this week blue alfalfa aphids. Tetonia, Kimberly, and Ririe traps all collected this aphid with Tetonia catching a record 72.


 

    These aphids are similar to pea aphids in that they damage alfalfa. Severe infestations can and will retard regrowth. They are so similar in appearance to pea aphids that you need to use the color and shape of the antenna to distinguish them apart. In the field, blue alfalfa aphids tend to be on the stems, where pea aphids prefer the leaves.

 Cereal Aphids 

          Populations of cereal aphids that are of concern continue to decline. If this trend continues, those growers, who’s normal planting window is in September, should not need to make any adjustments to normal planting practices.

Funded by the University of Idaho Agricultural Experiment Stations, and the Idaho Wheat and Barley Commissions.

Aphid data.jpg (14280 bytes)

Samples collected August 20,1999 

 

Cereal

Others

Total

Suction
Trap
Location

 

Russian Wheat Aphid

 

Green Bug

Bird Cherry Oat Aphid

 

English Grain Aphid

 

Rose Grass Aphid

 

Corn Leaf Aphid

 

Apple Grain Aphid

 

Green Peach Aphid

 

Potato Aphid

 

Pea Aphid

 

Spotted Alfalfa Aphid

 

Bean Aphid

 

(All Aphids)

 

 

Moscow

2

-

6

12

10

-

-

4

-

1

-

-

59

 

 

Lewiston*

-

-

-

-

-

-

-

-

-

-

-

-

NR

 

 

Parma

7

-

6

-

3

2

-

-

6

2

19

19

85

 

 

Picabo

-

-

-

-

-

-

-

-

-

-

-

-

NS

 

 

Kimberly

2

-

9

1

-

2

-

2

15

4

3

5

78

 

 

Burley

5

8

44

15

9

3

2

8

-

1

5

234

388

 

 

Aberdeen

1

7

95

21

57

17

2

1

2

2

1

99

317

 

 

Rockland

1

1

33

2

6

5

-

1

-

-

-

-

63

 

 

Arbon

5

5

105

3

10

6

-

1

2

2

-

3