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Studies on the biology and control of pests of seed beans (Phaseolus vulgaris) in northern Tanzania

Published online by Cambridge University Press:  10 July 2009

G. Swaine
G. Swaine
Affiliation:
Ministry of Agriculture, Northern Research Centre, Tengeru, Arusha, Tanzania
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Extract

Light-trap catches of Heliothis armigera (Hb.) reach peaks during the wet seasons, April and November–January. Initial infestation of seed beans by H. armigera occurs in April–May at the time of flowering of the early-sown crop, the adults probably originating from an earlier generation on maize. Two generations are completed during the main seed bean season, the first on early-sown beans and the second on later beans, and the dry period July–October may be passed in pupal diapause. Damage, caused by the older larvae eating the seeds in the pod, is prevented by spraying the young larvae with DDT (25% e.c. at 3 pt/2 gal spray/acre) (the standard treatment) or endosulfan (35% e.c. at 1½ pt/2 gal spray/acre) at about six weeks after the beans emerge.

Adults of the Pentatomid Nezara viridula (L.) invade bean fields from alternative host-plants at the same time as H. armigera. This species, even in small numbers, causes the loss of young pods and also damages or kills the developing seed. It is not controlled by the standard DDT treatment for H. armigera, but the following insecticides were found to be effective: γBHC 20% e.c. (1¼ pt), dieldrin 18% e.c. (2 pt) and endosulfan 35% e.c. (1½ pt) in 2 gal spray/acre. Where N. viridula and H. armigera are found together, the standard recommendation is endosulfan 35% e.c. (1½ pt/2 gal spray/acre).

The Coreids Acanthomia horrida (Germ.) and A. tomentosicollis (Stål) cause damage similar to that of N. viridula, but are serious only when infestations are heavy. They were found to be controlled by DDT, dieldrin or endosulfan at the rates given above.

Alatae of the bean aphis Aphis fabae Scop, invade bean fields mainly during the first two weeks of the crop, producing apterae which concentrate on the tip of the plants. Damage (stunting, and loss of flowers and pods) is serious only when large populations of apterae are produced on a high proportion of the young plants. The early infestation demands control measures separate from those for the other pests, the most effective being methyl-demeton 50% e.c. (½ pt/2 gal spray/acre) applied 3–4 weeks after emergence. Endosulfan, although promising and far less toxic than methyl-demeton to larvae of the predator Cheilomenes lunata (F.), was discarded on grounds of cost, as was dimethoate. Aphid populations reached a peak during July and August and decreased with the warmer weather in September. A large number of alternative host-plants is listed, but the source of the primary flight into beans is not known.

Melanagromyza phaseoli (Tryon), the life-cycle of which is completed in 23 days, is unimportant on seed beans as it is least abundant during the growing period of the main crop, but may damage plants suffering from water stress. Tunnelling in stems by larvae was controlled by seed dressings of aldrin or heptachlor (both 40% wettable powders mixed with seed at 1:200 w/w).

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 59 , Issue 2 , October 1969 , pp. 323 - 338
Copyright
Copyright © Cambridge University Press 1969

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References

Anon. (1951). Bean fly. In Veitch, R. et al. The Queensland agricultural and pastoral handbook. Vol. III, 2nd edn., 441–443. Brisbane, Dept. Agric. Stock.Google Scholar
Anon. (1956). The bean fly, Agromyza phaseoli.—Insect Pest Leafl. Dep. Agric. N.S.W. no. 25.Google Scholar
Anon. (1963). Bean fly control.—Rep. Div. trop. Past. C.S.I.R.O. 1962/63. Summary in PANS (A) 10, 174, 1964.Google Scholar
Burnett, G. F., Lee, C. W., Park, P. O. & Swaine, G. (1964). Aircraft applications of insecticides in East Africa. XVI. Low volume spraying of seed beans with DDT concentrate.—Misc. Rep. Trop. Pestic. Res. Inst. no. 464.Google Scholar
Caldwell, N. E. H. (1939). Bean fly control in southern Queensland.—Qd agric. J. 52, 393–396.Google Scholar
Coaker, T. H. (1959). Investigations on Heliothis armigera (Hb.) in Uganda.—Bull. ent. Res. 50, 487–506.Google Scholar
Ditman, L. P., Weiland, G. S. & Guill, J. H. Jr. (1940). The metabolism in the corn earworm. III. Weight, water, and diapause.—J. econ. Ent. 33, 282–295.Google Scholar
van der Goot, P. (1930). De Agromyza vliegjes der inlandsche katjanggewassen op Java.—Meded. Inst. PIZiekt., Buitenz. no. 78, 97 pp.Google Scholar
Jones, R. J. (1965). The use of cyclodiene insecticides as liquid seed dressings to control bean fly (Melanagromyza phaseoli) in species of Phaseolus and Vigna marina in south-eastern Queensland.—Aust. J. exp. Agric. Anim. Husb. 5 no. 19, 458–465.Google Scholar
Judenko, E., Johnson, C. G. & Taylor, L. R. (1952). The effect of A phis fabae Scop. on the growth and yield of field beans in a garden plot.—Pl. Path. 1, 60–63.Google Scholar
Kalshoven, L. G. E. (1950). De plagen van de cultuurgewassen in Indonesië. Deet I.—512 pp. 's-Gravenhage, Publ. W. van Hoeve.Google Scholar
Kirkpatrick, T. H. (1962). Notes on the life-histories of species of Heliothis (Lepidoptera: Noctuidae) from Queensland.—Qd J. agric. Sci. 19, 567–570.Google Scholar
Le Pelley, R. H. (1959). Agricultural insects of East Africa.—307 pp. Nairobi, E. Afr. High Commn.Google Scholar
Parsons, F. S. (1939). Investigations on the cotton bollworm, Heliothis armigera, Hübn. (obsoleta, Fabr.). Part I. The annual march of bollworm incidence and related factors.—Bull. ent. Res. 30, 321–338.Google Scholar
Parsons, F. S. (1940). Investigations on the cotton bollworm, Heliothis armigera, Hübn. Part III. Relationships between oviposition and the flowering curves of food-plants.—Bull. ent. Res. 31, 147–177.Google Scholar
Parsons, F. S. & Ullyett, G. C. (1936). Investigations on Trichogramma lutea, Gir., as a parasite of the cotton bollworm, Heliothis obsoleta, Fabr.—Bull. ent. Res. 27, 219–235.Google Scholar
Pearson, E. O. (1958). The insect pests of cotton in tropical Africa.—355 pp. London, Emp. Cott. Grow. Corp. & Commonw. Inst. Ent.Google Scholar
Reed, W. (1965). Heliothis armigera (Hb.) (Noctuidae) in Western Tanganyika. I—Biology, with special reference to the pupal stage.—Bull. ent. Res. 56, 117–125.Google Scholar
Shumakov, E. M. & Yakhimovich, L. A. (1955). Morphological and histological peculiarities of the metamorphosis of the cotton bollworm (Chloridea obsoleta F.) in connection with the phenomenon of diapause. [In Russian]—Dokl. Akad. Nauk SSSR 101, 779–782. (Abstr. in Rev. appl. Ent. (A) 44, 11–12. 1956.)Google Scholar
Tunstall, J. P. & Matthews, G. A. (1961). Cotton insect control recommendations for 1962 in the Federation of Rhodesia and Nyasaland.—Rhod. agric. J. 58, 289–299.Google Scholar
Valentine, E. W. (1956). Entomology.—Prog. Rep. Exp. Stns Emp. Cott. Grow. Corp. Tanganyika (East. Prov.) 1954–55, 10–14.Google Scholar
Valentine, E. W. (1959). Cotton pest control.—Bull. Minist. Agric. Tanganyika no. 3, 12 pp.Google Scholar
Van Someren, G. C. (1956). Notes on the bean fly {Agromyza phaseoli) and a trial with insecticidal seed dressing for control.—4 pp. Nairobi, Fison's Pest Control (East Africa) Ltd.Google Scholar
Walker, P. T. (1960). Insecticide studies on East African agricultural pests. III.—Seed dressings for the control of the bean fly, Melanagromyza phaseoli (Coq.), in Tanganyika.—Bull. ent. Res. 50, 781–793.Google Scholar
Wallace, G. B. (1939). French bean diseases and bean fly in East Africa.—E. Afr. agric. J. 5, 170–175.Google Scholar
Wallace, G. B. (1941). Yellow bean mosaic and notes on other bean diseases.—E. Afr. agric. J. 7, 114–115.Google Scholar
Way, M. J., Smith, P. M. & Potter, C. (1954). Studies on the bean aphid (A phis fabae Scop.) and its control on field beans.—Ann. appl. Biol. 41, 117–131.Google Scholar
Wickramasinghe, N. & Fernando, H. E. (1962). Investigations on insecticidal seed dressings, soil treatments and foliar sprays for the control of Melanagromyza phaseoli (Tryon) in Ceylon.—Bull. ent. Res. 53, 223–240.Google Scholar
Young, J. R. & Ditman, L. P. (1959). The effectiveness of some insecticides on several vegetable crops.—J. econ. Ent. 52, 477–481.Google Scholar