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Studies of cocoa tree genetic resistance to attack by Sahlbergella singularis (Haglund.) (Hemiptera: Miridae), have so far been based on field observations of cultivar performance. Although this approach was useful in guiding breeding programmes, observations on tree crops are timeconsuming (3–4 years) and labour-intensive. Thus a standard laboratory microassay method based on a study of the mirids’...
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