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2

Project Name Effective of Bio-extract LDD.7 for control Longkong Bark
Eating Caterpillar (Microchlora sp) on Longkong.
Soil Group Soil no. 32 Tha Khun series (Tha Khun series: Tkn)
Responsible person Mr.Phisut Phunsawat

Abstracts
Studying on use of biotic insecticides to control Bark eating caterpillar of
Longkong To reduce the useing the chemicals in Surattanee province. Beginning

October 2012 - September 2013. The objective is studying on using bio-extract LDD.7
control longkong bark eating caterpillar, chemical properties of the soil and
investment return. The experimental design was a Randomized Complete Block
Design (RCBD) which divided into 4 treatment with 5 replicates Method 1, Controller

Control, Method 2 sprayed with chlorpyrifos 120 cc per 20 liters of water, Method 3
sprayed with bio-extract LDD.7 sprayed the outbreak every 7 days and Method 4
sprayed with bio-extract LDD.7 sprayed the outbreak every 14 days. Soil data showed

that at the end of the experiment, all soil treatment had pH decrease. Increased
organic matter in treatment 3, sprayed with insecticides, bio-extract LDD.7 sprayed
with the outbreak every 7 days and treatment 4 sprayed with insecticides. Every 14
days, used bio-extract LDD.7. Phosphorus in soil is very high and Potassium is
increased in 3 treatment sprayed with bio-extract LDD.7 sprayed the outbreak every

7 days. Crop yield, Treatment 3 had A grade is 569 kilograms per rai. Treatment 1 had
B, C and low grade is 416, 202 and 50 kg per rai respectively. The ppercentage of
scars in the second method sprayed with chlorpyrifos 120 cc per 20 liters water was

minimal. For investment return, Treatment 2 was sprayed with chlorpyrifos 120 cc
per 20 liters of water, with the highest production cost of 29,543 baht per rai and the
Treatment 1, control plot had the lowest production cost of 9,121 baht per rai. Net
income was found at the highest income of 18,031 baht per rai, and the Treatment 2

was spraying with insecticides, with chlorpyrifos 120 cc per 20 liters of water, the
lowest net income is -163 baht per rai, so if you manage the orchard farm with
farmers, recommended to use method 3, sprayed with insecticides. bio-extract LDD.7
sprayed the area where the outbreak every 7 days.