Abstract:
In these experiments pests and diseases severity, infection time and suitable
insecticides and fungicides were studies from 2006 to 2008. At the first experiment
damage severity percentages of pests and diseases were recorded bi-weekly. Five
fungicides Tebiconasol (5ml/10L), Hexaconasol (20ml/10L), Propaconasol
(lOml/lOL), Copper based Champion (20g/10L) and Carbenderseem (7ml/10L)
with four insecticides Dimethoate (20ml/10L), Chlorphyrofos (15ml/ 10L),
Imidacloprid (lOml/lOL) and Phenyl Phyrasol (4ml/10L) were used as treatments of
second experiment and third experiment was designed with based on the results of
second experiment. Sulphur (80g/10L), Hexaconasol and Dimethoate, Hexaconasol
and Chlorphyrifos, Sulphur and chlorphyrifos, Sulphur and Dimethoate were used
as different treatments, as well as design was RCBD and untreated plots were
maintained as control. Treatments applications and data collection were done bi weekly. One month after seed germination, leaf minore (Acrocercops spp.) damage
was the highest (10%). At the same time leaf eating caterpillar (Dasychira
mendosa) damage was 1.75% and gradually increased up to 7.6%. Mite (Eriophytes
boiisi) and jumping plant louse (Trioza cinnamomi) galls appeared only after three
months, and end of nursery period it was recorded at 43 %, 0.1% respectively. Leaf
blight (Collatotrichum spp.) disease was observed at 0.1% and the end reached up
to 2.5%. Second experiment results revealed that, leaf blight was significantly
reduced by Hexaconasol, Tebiconasol and Propaconasol. However, Tebiconasol and
Propaconasol were badly affected the plant height and number of leaves per plant.
Leaf galls were reduced by Chlorphirofos and Dimethoate. Leaf eating caterpillar
damage significantly decreased with Chlorphyrifos. In second experiment, selected
pesticides were Hexaconasol, Dimethoate and Chlorphyrifos. As a result of third
experiment together with Sulphur and Chlorphyrifos recorded low damage severity
of leaf eating caterpillar and leaf galls. Leaf blight disease decreased in Sulphur
treated plots. At the nurseiy, economically important pests were leaf minore, mites
and leaf eating caterpillars and disease was leaf blight. Together with sulphur and
chlorphyrifos can be used to control both pests and diseases at the cinnamon
nursery
