The main problems in pummelo qualitative production are thrips, that destroy
young leaves, flowers and young fruits. The damage was found that fine leaf margins roll
upward bend on both sides, brown marks leaves. If the outbreak occurs during young fruit
stage, it may cause fruit-retarded, rough scarring on fruit surface. The efficiency of the
different insecticides was done using neem and tobacco extracts, petroleum oil, the mix of
these substances as an alternative treatments to replace synthetics insecticides. The
experiment was conducted in 4-5 years old trees at Tubtimsiam pummelo plantation in
Nakhon Si Thammarat Province. The result showed that the highest effectiveness was
abamectin 98.67%, and followed by imidacloprid, petroleum oil mix tobacco, petroleum oil
mix neem extract (azadirachtin 0.1%), neem extract (azadirachtin 0.1%), petroleum oil,
tobacco and water spraying, was giving 95.54 89.53 88.14 86.14 84.56 77.19 and 76.69 %
respectively, compared with non-treated control. The average percentage of leaf damage
after application treatment at 7, 14 and 21 days were found that all treatments were
significant differences from non-treated leaf damage.
Keywords
neem, petroleum oil, abamectin, imidacloprid
INTERNATIONAL JOURNAL OF AGRICULTURAL TECHNOLOGY
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