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"The crude seed oil of Piper guineense, each at a 10% concentration at the rate of 18 litres ha -1 significantly lowered damage by termites (Microtermes spp., Macrotermes bellicosus and M. subhyalinus) (Umeh & Ivbijaro, 1999). Neem seed oil inhibited growth of termite surface-tunnels (Yashroy & Gupta, 2000). For further references, annual meeting report of IRG can be consulted for efficacy of oils against termites. "