Volume 4 Number 10 October 2018

Nematicidal Efficacy of a Bioagent Pseudomonas flourescens for the Sustainable Management of Meloidogyne incognita on Cicer arietinum L

Authors: Amir Khan ; Moh. Tariq ; Mohd. Asif ; Faryad Khan ; Taruba Ansari ; Mansoor A. Siddiqui
Pages: 112-116
A pot experiment was conducted to evaluate the nematicidal efficacy of a biocontrol agent, Pseudomonas flourescens for the management of root-knot nematode, Meloidogyneincognita on chickpea (Cicer arietinum L.) cv.‘Avarodhi’ under glasshouse conditions. All the treatments were found to significantly improve the growth and physiological parameters of chickpea and reduction in pathological parameters as compare to untreated inoculated control. The highest improvement was observed in those plants treated with P. flourescens alone. Concomitant and sequential inoculation of P. flourescens with M.incognita also showed significant improvement in growth parameters of chickpea. Least enhancement in growth parameters was observed in those plants inoculated with nematode alone. It may be due to the nematcidal behaviour of P. flourescens against root-knot nematode, M. incognita. Hence, it may be concluded that P. flourescens as biocontrol agent is better substitute against chemical nematicides for the sustainable management of M. incognita and reduce environmental hazards.

Diversity of Flowering Insects and Their Impact on Yields of Phaseolus Vulgaris L. (Fabaceae) in Yaoundé (Cameroon)

Authors: Chantal Douka ; Dounia ; Stella Nguedjio Nganhou ; Francine Njiojip Doummen ; Armande Marie Merveille Mout Mengue ; Joseph Lebel Tamesse ; Fernand-Nestor Tchuenguem Fohouo
Pages: 105-111
To evaluate the diversity and impact of insect pollinators on pod and seed yields of Phaseolus vulgaris (red bean with small seeds), its foraging and pollinating behavior were studied in Yaoundé, during the mild raining season (March-June) in 2016 and 2017. Treatments included unlimited floral access by all visitors and bagged flowers to avoid all insect pollinators. For each year of study, observations were made on 55 ± 38 flowers per treatment. The seasonal rhythm of insects activities, its foraging behavior, and its impact on pollination (fruiting rate, number of seeds/pod and percentage of normal seeds) were recorded. Fourteen insect species visited P. vulgaris flowers. Out of 667 visits, Xylocopa olivacea, Halictus sp., Chalicodoma sp. and Apis mellifera adansonii were the most frequent visitors with 21.43 %, 19.49 %, 12.44 % and 10.04 % visits respectively. These insects collected nectar and pollen intensely and regulatedly. The foraging activities of insect pollinators increased the fruiting rate by 23.56 %, the number of seeds/pod by 46.31 % and the normal seeds by 21.49 %. Therefore, conservation of nests and colonies of insect pollinators close to P. vulgaris crop fields should be recommended to improve pod and seed production in the region.