Treat hard scale insects indoors with our Hard Scale Killer & let the both the larvae & adult predatory beetles of Chilocorus nigritus loose on this common greenhouse & conservatory pest. The greedy black ladybird-like beetles (use 3-5 per plant) are effective during longer days (March to October) & operate at temperatures in excess of 18ºC so are ideally suited to the warm conditions much loved by hard scale insects. The larvae are best suited to individual plant treatments & the adults will return excellent clear-up rates when applied to multiple plants during severe infestations. The adults are not effective in the winter as they need sunlight to be active so aim to supplement your biological control by using instead of the Hard Scale Insect Killer between October & March. Hard Scale Insect Killer is available in three pack sizes; 25 adults 25 larvae or 10 larvae. Please Note: this item will be dispatched at the optimum time for application which will now be from March 2011