Vernonia amygdalina Delile commonly called bitter leaf is a perennial shrub that belongs to the family of Asteraceae and grows throughout tropical Africa. It is probably the most used medicinal plant in the genus Vernonia. Insect pests caused serious damages on the leaves. In Cameroon, a new species of Hilda genus (Tettigometridae) was reported and described recently, Hilda cameroonensis Tamesse & Dongmo, for the first time on V. amygdalina. This insect caused leaves to shrivel. The population dynamic of that pest species was conducted in a natural farm, in the Yaounde Region, from November 2014 to October 2016. During the study, eggs, larvae, and adults were surveyed and counted once a week. Seven different generations of H. cameroonensis were recorded during the first years and six during the second years. The pest population was correlated with climatic parameters, mostly with relative humidity, temperature, wind speed, and rainfall. The main factors influencing the numerical fluctuation of the pest, and the outbreak periods of each of the developmental stages of the pest in the Yaounde region will be take into consideration by the integrated pest management.

Population Dynamic of Hilda Cameroonensis Tamesse & Dongmo (Tettigometridae) Pest of Vernonia amygdalina Delile in Yaoundé-Cameroon

Vernonia calvoana is a culture spread across the world and prized for its culinary and medicinal virtues. The data was collected in Yaounde, Central Cameroon region through manual harvesting at two stations from 2017 to 2019. A total of 168 species or morphospecies belonging to 47 families and 12 orders from two phyla were collected. The most abundant phylum was Arthropoda which represented 99.96% of the total number of all species, while Mollusca represented the rest. Within arthropoda, insecta class was found the most dominant. In Insecta, Formicidae and Aphididae were the most frequent families. At Nkolbisson, Hymenoptera and Hemiptera are more abundant on the purple variety than on the white variety. However, both are less abundant compared to those at Nlong-mvolye. The species Uroleucon compositae (37.01%), Hilda cameroonensis (4.67%) and Sphaerocoris annulus (2.71%) were the most abundant species recorded in all the three variants. Depending on the preference with the host plant, some orders have a distribution according to the site, but also, the variety.

	 

	Key words: Manual harvest, insecta, hymenoptera, hemiptera, Nkolbisson, Nlong-mvolye.

Nola Moiuml

Papers

Invertebrate fauna associated with the cultivation of Vernonia calvoana calvoana (Asteraceae) in Yaound (Center-Cameroon)