Ye / %W Clover Aphid

Yellow Clover Aphid

Item Type Article

Authors Tuttle, D. M.; Hopkins, L.; Butler, G. D.

Publisher College of Agriculture, University of Arizona (Tucson, AZ)

Journal Progressive Agriculture in Arizona

Download date 26/09/2021 15:33:48

Link to Item http://hdl.handle.net/10150/298114 Here are Radio and TV programs for farm listening.Be sure to tune in on your local stations. Cochise County Wednesday, 6:30 a.m. -KAWT Graham County Winged Saturday, 1: 00 p.m. -KGLU (About 12 times natural size Greenlee County Wednesday, 12:15 p.m. -KCLF Maricopa County Ye / %w CloverAphid Monday through Saturday, 6:10 a.m.- KTAR Sunday, 8:45 a.m. -KOY Pinal County Monday through Friday, 6:50 a.m. to By D. M. Tuttle, L. Hopkins, and G. D. Butler, Department of Entomology6: 55 a.m. (County Agent) ; 8:50 to 8:53 a.m.( Home Demonstration Agent)- KCKY In 1954 the yellow clover aphid, The- ed because of its effectiveness against the rioaphis ononidus (Kalt.)appeared foryellow clover aphid, its low toxicity toYavapai County the first time in the southwestern Unitedwarm- blooded animals, and the short per- Monday, Wednesday, Friday, 8:45 to States as a serious pest of alfalfa, bothsistence of its residues. Although para-8:50 a.m. -KYCA for hay and seed. This aphid has longthion is effective for the control of this been known as a minor pest of clover inaphid, it is very dangerous to both ani-Yuma County eastern United States. mals and humans. Monday, Wednesday, Friday, 7:20 a.m. In 1954, the yellow clover aphid was ( Western Farm Digest) -KYUM foundinfestingArizonaalfalfanear Warning for Hay' Tuesday and Thursday, 7:20 a.m. (On Yuma, Parker, Roll, Buckeye, Tucson, in the Farm Front) -KYUM The combination of DDT, toxaphene, parts of Cochise County and in the Salt Thursday (TV),7:15 p.m. -KIVA River Valley. Other states of the South- and sulfur should not be used for treating west from which this aphid was first re-alfalfa grown for hay since the residues University of Arizona ported in 1954 include California, New have longer persistence. However, in seed Saturday, 12:30 to 1:00 p.m. ( Arizona Mexico, Texas, Nevada and Colorado. alfalfa, the latter combination affords con- Farm and Ranch Hour) -KOY, Phoenix; trol of the yellow clover aphid as well asKTUC, Tucson; KSUN, Bisbee; KYMA, Pl0nts Defoliated the other harmful insects often present. Yuma; KCLS, Flagstaff; KVNC, Wins- When aphids of this species are abund- Other promising insecticides in pre-low; KAWT, Douglas ant,theplantsaredefoliated.Large liminary tests included methyl parathion Saturday (TV),4:30 to 5:00 p.m.- amounts of "honeydew" are deposited on and clorothion, although as yet these are ( AcrosstheFence) - KVAR, Mesa, the leaves, stems and ground, making bal-not registered for use on alfalfa. Channel 12 ing difficult or impossible. The nymphs and adults of the yellow clover aphid are found on the undersides of the leaves. Effect of Various Dust Formulations The lower leaves of the plant are infested On Populations of Yellow Clover Aphid fist, become dry, and fall off. This defoliation results in reduction of (Treatments applied to alfalfa on July 6, 1954, usinga Hardie yield and quality of the hay due to stem - duster, Yuma Mesa, Arizona.) miness. The quality of the hay is further reduced by discoloration from a black Treatment Number of aphids per 100 netsweeps fungus on the honeydew. Indications are (18 pounds per acre) July 8 July 10 that defoliation of the plant affects seed yields and also retards regrowth of the 5% Malathion 8 43 alfalfa following cutting. 2% Parathion 55 130 The control of the yellow clover aphid 5% DDT, 15% Toxaphene, is easily accomplished with several insec- 40% Sulfur 236 17 ticides.Some of the materials used in 1954 are shown in the table below. Untreated 6200 1771 For hay crops, malathion is recommend- Difference required for significance: 5% 396 502 Page 11 January, February, March 1% 538 683