Abstract:The EucalyptuThe Eucalyptus leaf-roller (Pelochrista sp.) is an important insect pest of Eucalyptus in South China.It has 8 to 9 generations a year in Canton.The pest does not enter hibernation in winter and the population has its maxima from September to December.Raining may check its multiplication while drought favours it. It is a oligophagy insect.It infests some species of cultivated and wild plants belonging to Myrtaceae.The larvae may cause serious injury to the young buds and leaves.They web several leaves together to form temporary nest.They feed on the planttissue enclosed by their nests.The larval stage has five instars and the mature larva pupates mostly in the soil. The moth needs supplemental water or nutrients after emergence.It hides during the day in shaded places and mating and oviposition take place at night.The eggs are laid singly on the surface of the leaf and the maximal number of eggs produced by a single female is 264(56 in average). Preliminary field control experiments showed that 50ppm TH6040 and 0.075% Phoxim or 0.080% Dichlorvos emulsion were very effective against the larva,mortality reached 89—100%.