Abstract:
Globally, it has been estimated that more than 100,000 species of wild plants depend
on insects for pollination and reproduction. In Africa, and for that matter Ghana, not
much is known about crop pollinators, especially legumes such as cowpea. In Ghana,
little is known about even insects that visit the cowpea flowers. However, if the
insects that visit the cowpea flowers are known it would serve as a platform to
investigate insects that can possibly cause pollination in cowpea. Hence, this study
was undertaken to verify the types of insects that visit cowpea flowers in three
districts in the Central Region of Ghana. As a result, insects that visited cowpea
flowers on surveyed, and the researcher’s own established farms were observed on the
petals, tip of the stigma and inside the flowers. Samples of insects collected were
identified. Also, percentage frequency of occurrence of the insects on the various
parts of the flowers was determined. Differences between total frequencies were
determined using chi square (÷²) analysis. The main insects observed on the cowpea
flowers were bees such as Apis mellifera, Ceratina sp, Megachile sp, Xylocopa
calens, Xylocopa imitator, Braussepis sp., .Lipotriches sp., Melecta sp and Amegilla
sp. and other insects, such as thrips, flies, butterflies / moths, beetles, and Dysdercus
sp. Thrips were the insects most often observed on the cowpea flowers in the surveyed
farms, followed by flies or dipterans, Lasioglossium sp and butterflies/moths. From
the researcher’s own established farm, during the minor rainy season, the most active
insect observed on the tip of stigmas of the flowers was Megachile sp whilst thrips,
butterflies / moths, Lasioglossum sp. and flies were active on the petals of the flowers.
The differences between the total frequencies were highly significant (÷² = 154.61; P
= 0.001). Indications are that Ceratina is most likely to be cowpea flower pest rather
than a pollinator. However, further research into the role of Ceratina on cowpea
flowers is recommended.
