Field infestation of pigeonpea (Cajanus cajan (L.) Millsp.) by Callosobruchus chinensis (L.) in Uganda

Nahdy, M. Silim; Ellis, R. H.; Silim, S. N.; Smith, J. C.

doi:10.1016/s0022-474x(97)00043-x

Cited by 22 publications

(4 citation statements)

References 22 publications

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“…The behavioral effects of these changes can be monitored using acoustic means to show when insect quiescence occurs. Therefore, this study found that the different population levels of C. maculatus produced sound impulses with a broad range of amplitudes, spectral features, and temporal patterns, and which were comparable with those observed for other stored product pests such as Prostephanus truncatus (Coleoptera: Bostrichidae), Sitophilus zeamais (Coleoptera: Curculionidae), Acanthoscelides obtectus (Coleoptera: Chrysomelidae: Bruchinae), and Sitophilus oryzae (Coleoptera: Curculionidae) [ 29 , 30 , 31 , 37 ].…”

Section: Discussionsupporting

confidence: 78%

“…Assuming an initial infestation for cowpea of eight insects/kg [ 30 ], it was determined that 100 kg of cowpea could have a total of 800 insects at the onset of storage. These values of estimated available oxygen and initial infestation were used to determine the time taken to reach the critical oxygen level where C. maculatus does not cause significant damage to stored cowpea, as explained in the discussion.…”

Section: Methodsmentioning

confidence: 99%

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Oxygen Consumption and Acoustic Activity of Adult Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae: Bruchinae) during Hermetic Storage

Njoroge

Mankin

Smith

et al. 2018

Insects

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Acoustic monitoring was applied to consider hermetic exposure durations and oxygen levels required to stop adult Callosobruchus maculatus activity and economic damage on cowpea. A 15-d study was conducted with six treatments of 25, 50, and 100 C. maculatus adults in 500 and 1000 mL jars using acoustic probes inserted through stoppers sealing the jars. Acoustic activity as a result of locomotion, mating, and egg-laying was measured by identifying sound impulses with frequency spectra representative of known insect sounds, and counting trains (bursts) of impulses separated by intervals of <200 ms, that typically are produced only by insects. By the end of the first week of storage in all treatments, oxygen levels declined to levels below 4%, which has been demonstrated to cause mortality in previous studies. Concomitantly, insect sound burst rates dropped below an acoustic detection threshold of 0.02 bursts s−1, indicating that the insects had ceased feeding. Statistically significant relationships were obtained between two different measures of the acoustic activity and the residual oxygen level. Based on the experimental results, a simple equation can be used to estimate the time needed for oxygen to decline to levels that limit insect feeding damage and thus grain losses in hermetic storage containers of different insect population levels and various volumes.

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Section: Discussionsupporting

confidence: 78%

Section: Methodsmentioning

confidence: 99%

Oxygen Consumption and Acoustic Activity of Adult Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae: Bruchinae) during Hermetic Storage

Njoroge

Mankin

Smith

et al. 2018

Insects

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“…Pre‐harvest infestation by bruchids ( Callosobruchus spp.) and weevils ( Callosobruchus chinensis) may cause only limited damage but have serious implications during storage (Silim Nahdy et al , 1998; Silim Nahdy and Agona, 2000). Chemical treatment of these pests remains unaffordable to the smallholder farmers.…”

Section: Constraints To Pigeonpea Production In Africamentioning

confidence: 99%

The potential of pigeonpea (Cajanus cajan (L.) Millsp.) in Africa

Odeny

2007

Natural Resources Forum

132

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Pigeonpea is a tropical grain legume grown mainly in India. Though largely considered an orphan crop, pigeonpea has a huge untapped potential for improvement both in quantity and quality of production in Africa. More than any other legume adapted to the region, pigeonpea uniquely combines optimal nutritional profiles, high tolerance to environmental stresses, high biomass productivity and most nutrient and moisture contributions to the soil. The legume can be utilized in several diverse ways while the high genetic variability that exists within the cultivated and wild relatives remains to be explored for further uses. This article highlights the need for popularizing pigeonpea as a major legume crop in Africa. The main constraints to productivity are discussed and recent breeding efforts in Africa highlighted. Important opportunities for improvement are further provided.

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“…Thus, the plants and seeds may be exposed to attack by bruchids ( Callosobruchus spp. Coleoptera: Bruchidae) (Nadhy et al., 1998), larvae of Lepidopteran species (Viteri et al., 2019; Volp et al., 2023), infection of fungal species ( Aspergillus spp., Botryodiplodia theobromae Pat., Fusarium spp., and Phomopsis spp. ([Ellis et al., 1978; Hepperly & Rodríguez, 1984]), and/or adverse environmental effects (e.g., waterlogging [Hepperly & Rodríguez, 1986]) that can significantly reduce seed yield and quality.…”

Section: Introductionmentioning

confidence: 99%

Registration of indeterminate and photoperiod‐insensitive IIPG‐7 and IIPG‐11 pigeonpea germplasm

Viteri,

Linares‐Ramírez

2024

J of Plant Registrations

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Pigeonpea [Cajanus cajan (L.) Mill.] breeding lines (BL) IIPG‐7 (Reg. no. GP‐326, PI 704909) and IIPG‐11 (Reg. no. GP‐327, PI 704910) were developed at the University of Puerto Rico. Both BL were bred to have indeterminate flowering habit and photoperiod insensitivity. The agronomic performance of IIPG‐7, IIPG‐11, and checks was tested during different growing seasons in Isabela and Lajas, Puerto Rico. IIPG‐7 and IIPG‐11 were early maturing and initiated flowering at 73–84 days after planting (DAP), reaching harvest maturity at 121–127 DAP. This was in comparison to indeterminate cultivars ‘Ariel’, ‘Blanco Yauco’, ‘Kaki’, ‘Pinto Berrocales’, and ‘Super Pinto’, which initiated flowering at 91–102 DAP, reaching maturity at 138–148 DAP in short‐day conditions that occurred in October in both locations. These cultivars had seed yield values of over 1000 kg ha−1, whereas IIPG‐7 and IIPG‐11 produced 721–1010 kg ha−1. In contrast, IIPG‐7 and IIPG‐11 were the only indeterminate genotypes that initiated flowering at 42–88 DAP and reached maturity at 88–172 DAP under long‐day conditions (February, March, and May) in both locations. Seed yields of IIPG‐7 and IIPG‐11 varied from 626 to 2449 kg ha−1 in Isabela and were close to 2000 kg ha−1 in Lajas. IIPG‐7 has tan seed with reddish spots; IIPG‐11 has reddish seed with an average weight of 14 and 15 g per 100 seeds, respectively. The IIPG‐7 and IIPG‐11 BL can be used directly by growers or breeders to develop pigeonpea cultivars that can be planted year‐round.

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Field infestation of pigeonpea (Cajanus cajan (L.) Millsp.) by Callosobruchus chinensis (L.) in Uganda

Cited by 22 publications

References 22 publications

Oxygen Consumption and Acoustic Activity of Adult Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae: Bruchinae) during Hermetic Storage

Oxygen Consumption and Acoustic Activity of Adult Callosobruchus maculatus (F.) (Coleoptera: Chrysomelidae: Bruchinae) during Hermetic Storage

The potential of pigeonpea (Cajanus cajan (L.) Millsp.) in Africa

Registration of indeterminate and photoperiod‐insensitive IIPG‐7 and IIPG‐11 pigeonpea germplasm

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