In Viet Nam, frequent outbreaks of the native pine caterpillar, Dendrolimus punctatus Walker (lepidoptera: Lasiocampidae), are beginning to occur in young plantations of Pinus massoniana Lamb. and P. merkussi Jungh and de Vriese. Severe defoliation reduces volume growth and resin production; repeated defoliation may cause tree mortality. Current control programs rely heavily on manual methods (hand-removal and destruction of life-stages), use of light traps to catch adult moths, and some insecticide applications. A more integrated approach to prevention and control is suggested in pine forestry programs to reduce defoliator problems. Short-term approaches should focus on biological control, including mass production and application of microbial agents and parasitic insects, rather than total reliance on chemical pesticides. Long-term solutions will need to involve the establishment of mixed stands of different pine species or pines and hardwoods, replacement of pines with non-host species on high-hazard sites, increased fire prevention, and further professional training of Vietnamese protection personnel in all phases of integrated pest management. © 1991.
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