Pest Control Consultant, Plot 220, Reshimbag, Nagpur - 440 009, Maharashtra, (India).
Population dynamics of H. armigera studied during 1996–98 indicated maximum infestation level (95%) and pest density (31 larvae/5 flowers) during winter (January–March), minimum (6% infested flowers with 4–5 larvae/5 flowers) during summer (June–August) and 0% in November 1996. Number of larvae was linearly and significantly associated with flower infestation level. Maximum and minimum temperature, minimum relative humidity and rainfall intensity showed significant negative effect on the level of infested flowers and density of larval populations. A greater number of eggs were laid on flowers than on flower buds or leaves. Within-flower distribution of eggs and larvae was dependent on rose variety, plant part, flower growth stage and position on the plant.
