The study assessed the effectiveness of Savanem 20 EC (Ethoprophos, 200g/l), a newly introduced nematicide on the plant-parasitic nematodes associated with sweet pepper (Capsicum annuum), the second most important vegetable crop after the onions in Niger. This product was compared with Furadan 5G (Carbofuran). The results show that Savanem 20 EC at the rate of 50 L/ha is more effective than Furadan at the rate of 40 kg/ha in suppressing population of Meloidogyne spp. and reducing the root gall index. Despite its higher effectiveness against root-knot nematodes, Savanem did not significantly out yield Furadan.

Cashew plantations are established mainly from young seedlings from nurseries. These seedlings can be sources of disease contamination in plantations. In this paper, the perception of cashew nursery producers on the diseases associated with cashew seedlings and their management methods, the inventory and distribution of these diseases in three agroecological zones (AEZ) of Benin were investigated. Thus, a survey was conducted in the three AEZs to collect data on nursery management and samples of diseased seedlings. The results revealed anthracnose development caused by Colletotrichum gloeosporioides, bacterial leaf spot caused by Xanthomonas axonopodis pv. anacardii and black spot disease caused by Phyllosticta sp. on cashew seedlings in nurseries in the three AEZ. Significant differences, high disease incidence and severity were recorded across AEZs, municipalities and sites (p < 0.05). The highest incidence and severity were 19.33 and 8.8%, respectively for anthracnose, 23.10 and 8.9% for bacterial leaf spot, 18 and 2.76% for black spot disease. Keywords: Cashew seedlings, production system, diseases, management.

This study consisted of: (i) evaluating six varieties of irrigated rice, endowed with the resistance allele rymv1-2, under the agronomic conditions of Niger Republic, and by participatory varietal selection (PVS), (ii) identifying the preferred varieties of farmers, and (iii) determining the performance of improved lines. To achieve these objectives the improved varieties’ behavior towards the RYMV was first evaluated in the greenhouse and then their agronomic performance evaluations were conducted in multi-local trials. The results showed a biological diversity of Niger-RYMV, with the prevalence of a resistant breaking isolate (NG3) from the Toula perimeter. Five of the six improved varieties have good production potential and are adapted to the ecological and epidemiological conditions of the Niger Republic. Indeed, in addition to their high level of resistance to RYMV, the varieties ARC39-135-VL-5, ARC39-130-EP-4, ARC37-16-1-5-G, ARC39-145-E-P-3 and ARC 39-155-L-2 expressed the best agronomic characteristics with yields ranging between 6 and 9 T/ha vs 4 to 5 T/ha for the Kogoni 91-1 variety which is the most productive in the studied area. These high-potential varieties will help in the intensification of rice cultivation and rice yellow mottle disease control.