Incidence oj decline in growth of guava caused by the nematode, Meloidogyne incognita, in several states in Malaysia is reported for the first time. The nematode infested plant manifested adrastic reduction in plant growth, small leaves, absence of fine roots, a poorly developed root system, and a decline in yield quality and quantity. Severely infested roots are distorted by small and large multiple galls. Factors influencing the spread and survival oj the nematode are also discussed.