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STUDY ON MORPHOLOGY, BIOLOGY OF Thrips palmi AND EFFICIENCY OF DIFFERENT CONCENTRATION OF NEEM LEAF EXTRACT ON DRAGON FRUIT

2019.10.25

ABSTRACT

A study on morphology and biology of Thrips palmi and effect of some insecticides and neem leaf extract on dragon
fruit was conducted at Southern Horticultural Research Institute (SOFRI) and the dragon fruit farms at Duong
Xuan Hoi village, Chau Thanh district, Long An province from April 2016 to December 2017. The results showed
that the adult of Thrips palmi was light yellow, antennae of male had seven segments and eggs were milky white in
color. The life cycle of Thrips palmi completed in 14 - 22 days. The lab trial to study efficiency of nine concentrations
of neem leaf extract was conducted at Plant Protection Division-SOFRI; the results showed that two treatments of
neem leaf extract were highly effective against Thrips palmi with a concentration of 8% (80.83%) and 9% (84.64%) at
7 days after spraying in lab conditions. The results on field trial indicated that neem leaf extract at 8% concentration
was 77.91% efficient, which was as effective as Spinetoram, Imidacloprid, and Azadirachtin + Emamectin to control
Thrips palmi at field condition. The rate of “ring net” phenomenon of four treatments: Spinetoram, Imidacloprid,
Azadirachtin + Emamectin, and Azadirachta indica-neem leaf extract (12.75 - 17.43%) were low and significantly
different compared with the control (42.12%).
Author: ​Tran Thi My Hanh*1,Nguyen Thi Cam Giang1,
Nguyen Van Hoa1, Rangaswamy Muniappan2
1 Southern Horticultural Research Institute, Box 203, My Tho city, Tien Giang, Vietnam
2 IPM Innovation Lab, Virginia Tech, 526 Prices Fork Road, Blacksburg, VA 24061
* Corresponding author: Tran Thi My Hanh. Email: hanhvcaq7@gmail.com
Keywords: Dragon fruit, neem leaf extract, “ring net” phenomenon, soft insecticides, Thrips palmi
A study on morphology and biology of Thrips palmi and effect of some insecticides and neem leaf extract on dragon
fruit was conducted at Southern Horticultural Research Institute (SOFRI) and the dragon fruit farms at Duong
Xuan Hoi village, Chau Thanh district, Long An province from April 2016 to December 2017. The results showed
that the adult of Thrips palmi was light yellow, antennae of male had seven segments and eggs were milky white in
color. The life cycle of Thrips palmi completed in 14 - 22 days. The lab trial to study efficiency of nine concentrations
of neem leaf extract was conducted at Plant Protection Division-SOFRI; the results showed that two treatments of
neem leaf extract were highly effective against Thrips palmi with a concentration of 8% (80.83%) and 9% (84.64%) at
7 days after spraying in lab conditions. The results on field trial indicated that neem leaf extract at 8% concentration
was 77.91% efficient, which was as effective as Spinetoram, Imidacloprid, and Azadirachtin + Emamectin to control
Thrips palmi at field condition. The rate of “ring net” phenomenon of four treatments: Spinetoram, Imidacloprid,
Azadirachtin + Emamectin, and Azadirachta indica-neem leaf extract (12.75 - 17.43%) were low and significantly
different compared with the control (42.12%).

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