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The biology of Maruca testulalis Geyer was studied on different parts of 18 cowpea cultivars to determine the role of antibiosis in their levels of resistance. M. testulalis larvae were successfully reared from first instar to adult stage on floral buds, flowers and sliced pods, but not on stems terminal shoots and intact (unsliced) pods, where there was complete larval mortality. Growth indic ...

SUBJECT: varieties; pest resistance; antagonism; variedades; resistencia a las plagas

POSTED TO: Insect Science and its Application [0191-9040]

Competition between larvae of Sitophilus oryzae (L.) and Sitotroga cerealella (Oliv.) within sorghum grains was studied at 30 degrees centigrade and 70 percent r.h. Newly hatched S. cerealella larvae (0-24 hr) were allowed to infest single sorghum grain having one S. oryzae egg deposited either on the endosperm half or the germ half, S. cerealella larvae were obtained from eggs of the same age ...

SUBJECT: sitophilus oryzae; infestation; sitotroga cerealella; sorgho; competition biologique

POSTED TO: Insect Science and its Application [0191-9040]

Earias vittella (Fabricius) feeds on some malvaceous plant species, but has never been reported to attack Thespesia populnea Cav., even though this plant belongs to the same family. The factors responsible for the failure of E. vittella to establish on T. populnea were, therefore, studied. When whole fruits or fruit pericarps of this plant were provided as larval food, larvae failed to develop ...

SUBJECT: etanol; phagorepulsif; graisse brute; grasa bruta; earias vittella

POSTED TO: Insect Science and its Application (ICIPE) [0191-9040]

Nature of resistance against the rice leaffolder, Cnaphalocrocis medinalis(Guenee) was studied in 16 rice varieties selected on the basis of greenhouse feeding test. Resistant varieties as a group were less preferred for feeding by larvae in a free choice test lasting 10 days. Cut leaf assay with limited choice brought out subtle differences among some of the test varieties in larval settling ...

SUBJECT: cnaphalocrocis medinalis; variedades; variete; resistencia a las plagas; antagonisme

POSTED TO: Insect Science and its Applications (ICIPE) [0191-9040]

Four maize varieties, 8321-21-W, DMR-LSR-W, ACR-83TZUT-W and TZB were simultaneously fed to Sitophilus zeamais in a completely randomized design. Susceptibility was assessed on such parameters as weight loss of grains caused by weevil infestation, number of progenies assesed on such parameters as weight loss of grains caused by weevil infestation, number of progenies at 42 days after infestati ...

SUBJECT: sitophilus zeamais; zea mays; resistencia a las plagas; resistance aux organismes nuisibles

POSTED TO: Insect Science and its Applications (ICIPE) [0191-9040]

A series of experiments involving plots of sole cowpeas and sorghum/cowpea intercrops were carried out, on-farm, in Minjibirr village, northern Nigeria between 1986 and 1988. The objectives were to: (1) elucidate the relationships between sorghum/cowpea intercropping, insect pest numbers and grain yield reductions in cowpea. (2) examine the role of sorghum/cowpea intercropping alone or togethe ...

SUBJECT: sorghum; nigeria; cultivo intercalado; rendement des cultures; cultivo puro

POSTED TO: Insect Science and its Application (ICIPE) [0191-9040]

An experiment to examine the effects of four agrometeorological factors on population fluctuations in legume pod borer, Maruca testulalis (Geyer) in two cowpea varieties was carried out under field conditions in Ibadan, Nigeria. Plots, 5 by 10m each, of cowpea varieties IT84s-2246-4 and Dan ilan were planted fortnightly between 5 May and 5 October 1988 (12 plantings in all for each variety). T ...

SUBJECT: meteorologie; caupi; niebe; nigeria; meteorologia

POSTED TO: Insect Science and its Applications (ICIPE) [0191-9040]

Several strains of Hyphomycetes fungi were assayed in the laboratory to determine their pathogenicity against second instar Chilo partellus Swinhoe larvae and fifth-sixth instar Busseola fusca Fuller larvae. Pathogenic activity to both stem borers was demonstrated with Beauveria bassiana (Balsamo) Vuillemin and Metarhizium anisopliae (Metschnikoff) sorokin. B. bassiana isolates caused mortalit ...

SUBJECT: poder patogeno; deuteromycotina; beauveria bassiana; ensayo biologico; busseola fusca

POSTED TO: Insect Science and its Applications (ICIPE) [0191-9040]

The effect of plant growth habit (Erect versus spreading and flowering pattern) on the resistance of cowpea Vigna unguiculata (L.) Walp., to the legume pod borer, Maruca testulalis Geyer, were studied in Nigeria. Five cowpea cultivars of known agronomic and architectural characteristics were selected for the study: TVu 946, IT82D-716, VIT-3, Oloka local and Kamboinse local. Seed and pod damage ...

SUBJECT: nigeria; habitos de crecimiento; resistencia a las plagas; vigna unguiculata; port de la plante

POSTED TO: Insect Science and its Applications (ICIPE) [0191-9040]

Two species of rice leaffolders, Cnaphalocrocis medinalis (Guenee) and Marasmia patnalis Bradley are usually found in association on rice plants in South and Southeast Asia. Larvae of the two species are similar in morphology, as is their feeding behaviour. Spinning, the process of stitching leaf margins together to form a leaf roll before the initiation of feeding process, is an important beh ...

SUBJECT: asie; hilado; marasmia; cnaphalocrocis medinalis; comportement alimentaire

POSTED TO: Insect Science and its Applications (ICIPE) [0191-9040]