Contents—continued from outside back cover]

TAKESHI AOATSUMA and LEONARD H. OTIENO 527 Isoenzyrne studies on two field populations of Glossina pallidipes Austen (Diptera, Glossinidae) in

V. B. YADWAD and V. L. KALLAPUR 531 Influence of temperature on knock-down and mortality to fenitro- thion in the three Lepidopteran species of

A. A. SEIF and A. S. ISLAM 535 Population densities and spatial distribution patterns of Toxoptera citricida (Kirk.) (Aphididae) in citrus at Kenya Coast

DAE JOON IM, B. M. SHEPARD 539 Pathogenicity and histopathology of a nuclear polyhedrosis virus and R. M. AGUDA of Spodoptera litura (Fab.)

T. I. OFUYA and A. E. AKINGBOHUNGBE 543 Functional and numerical responses of Cheilomenes lunata (Fabri- cius) (Coleoptera: Coccinellidae) feeding on the cowpea aphid, Aphis craccivora Koch (Homoptera: Aphididae)

B. M. KHAEMBA and F. M. E. WANJALA 547 Evaluation of coffee canopy damage by Dirphya nigricomis Olivier (Coleoptera: Cerambycidae)

S. N. OKIWELU, C. B. NDOME and Y. F. IDE 557 pests of leafy vegetables in Rivers State, Nigeria—I. Feeding habits and infestation of the bitterleaf weevil Lixus camerunus Kolbe (Coleoptera: Curculionidae)

J. A. KONGORO and T. R. ODHIAMBO 563 Functional ultrastructure of malpighian tubules of tsetse, Glossina morsitans morsilans (Diptera: Glossinidae)

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VOLUME 9 NUMBER 4 1988

CONTENTS

SAOARY NOKOE and Lucre M. ROGO 429 A discriminant function for the short- and long-setaed forms of Mononychellus (Acari: Tetranchidae) species complex

M. WYSOKI and M. H. M. SCHEEPENS 433 Effect of 20 strains of Bacillus thuringiensis Berliner on larvae of Boarmia selenaria Schiffermuller (: Geometridae)

RAKA KAMAL, MINA MANGLA, D. PRAKASH, 437 Relative toxicity of natural pyrethrins against Mesocyclops G. L. SHARMA and C. SRIVASTAVA leuckarti sensu lato—the carrier of dracunculiasis

A. K. CHAKRAVARTHY and S. LINGAPPA 441 Plant characteristics and mechanisms of resistance in field bean to the pod borer atkinsoni Moore and screening the germ- plasm to the aphid, Aphis craccivora Koch damage

CLIFFORD M. MUTERO, 453 Development of Leishmania spp. in mosquitoes—I. Experimental MUTUKU J. MUTINGA and DAVID OMOGO infection of Aedes aegypti with Leishmania donovani promastigotes

J. BARTKOWSKI, M. O. ODINDO 457 Some fungal pathogens of the cassava green spider mites Mono- and W. A. OTIENO nychellus spp. (Tetranychidae) in Kenya

B. C. NJAU, P. A. MKONYI and K. LEKAKI 461 Susceptibility of a Trypanosoma congolense isolate of water buffalo origin to diminazene aceturate and isometamidium chloride

AZIZA SHARABY 465 Evaluation of some Myrataceae plant leaves as protectants against the infestation by Sitophilus oryzae L. and Sitophilus granarius L.

D. DAKOUO, S. NACRO and M. SIE 469 Evolution saisonniere des infestations de la cecidomyie du riz, Orseolia oryzivora H. et G. (Diptera, Cecidomyiidae) dans le Sud-Ouest du Burkina Faso

ELIZABETH D. KOKWARO 475 Ultrastructural characteristics of the ejaculatory duct of the male and JOYCE K. MURIITHI tsetse, Glossina morsitans morsitans

T. OMORI, B. L. AGRAWAL and L. R. HOUSE 483 Genetic divergence for resistance to shootfly, Atherigona soccata Rond. in sorghum, Sorghum bicolor (L.) Moench and its relation- ship with heterosis

P. N. KRISHNA MOORTHY, G. C. TEWARI 489 Action thresholds for the management of pod borer, Adisura and K. SRINIVASAN atkinsoni Moore on field bean, purpureus

E. O. LYIMO and R. J. IRVING-BELL 493 Orcadian flight activity of mosquitoes entering and leaving septic tanks in central Nigeria

MANTHRI S. RAMASAMY, MICHAEL SANDS, 499 Mosquito vitellin: Structural and functional studies with mono- JULIE GALE and RANJAN RAMASAMY clonal antibodies

B. TENGECHO, C. L. COULSON 505 Distribution and effect of bean flies, Ophiomyia phaseoli and and H. A. D'SOUZA O. spencerella on beans at Kabete, Kenya

C. W. BALIDDAWA 509 The effect of crop microenvironment on the pea leaf weevil's behaviour: An explanation for weevil departure from diverse cropping systems

ABRAHAM VERGHESE, P. L. TANDON 515 Spatial distribution pattern and sampling plan for the blister midge, and G. S. PRASADA RAO Erosomyia indica Grover (Cecidomyiidae: Diptera) in

SRIPADA M. UDUPA 519 Heterosis in single, three-way and double cross hybrids of silk- and B. L. VISWESWARA GOWDA worm, Bombyx mori L.

[continued on inside back cover Indexed/Abstracted in Current Contents, CABS, C.A.B. International, BIOSIS, The African ISSN 0191-9040 Book Publishing Record, Allen Press Subscription Catalogue ISIADL 9(4) 429-572 (1988)

Printed in Great Britain by A. Wheaton & Co. Ltd, Exeter 606

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