The effects of shade on the attack by Hypsipyla robustawere investigated in red cedar seedlings
(Toona ciliata) planted in the open (no shade) and under neem, Azadirachta indicaA.Juss. (Meliaceae)
shade. Seventy-two T. ciliata were planted in each plot. The trial was regularly monitored, assessing
both the physical characteristics of the trees and damage by H. robusta at 12 and 24 months after
planting. T. ciliata in the open plot was seriously attacked, with attacks at 12 and 24 months after
planting of 93% (2 attacks/tree) and 100% (12 attacks/tree), respectively. T. ciliata planted under shade
had no attacks at 12 months, but 43% of the seedlings were attacked (at least one attack/tree) at 24
months after planting. The general performance of T. ciliata trees in the open plot was very poor, while
the trees under shade were in good form and taller than the trees in the open planted plot.
Key words: Hypsipyla robusta, shoot borer, Toona ciliata, Azadirachta indica, shade tree