The study of non-chemical managements on biting midge, Forcipomyia taiwana
Date Issued
2010
Date
2010
Author(s)
Chen, Chi-Rong
Abstract
Biting midge, Forcipomyia taiwana, is one of the most annoying blood-sucking pest in Taiwan. This study aimed on the non-chemical control strategy. There are three strategies proposed: 1. to inhibit the growth of blue green algae, 2. to investigate the repellent of the biting midge and 3. to investigate the oviposition attractant substrate for the biting midge. 1. Previous study suggested that the blue green algae were the best diet to larvae, therefore, inhibiting the algae growth represented the strategy for F. taiwana control. Current studies showed that three kinds of plant ash refined from corn stalk, rice stalk and herbage stalk dose-dependently inhibited the growth of Chlorella sp. The growth of Chlorella was inhibited up to 90% in the presence of 0.04 % ash, indicating that plant ashes are potential agents for Chlorella algae control. 2. The extract of djulis (Chenopodium formosanum) and two human-derived odors (geranylacetone (GA), 6-methyl-5-hepten-2-one (6MHO) ) were investigated for their repellent effect on F. taiwana. The results showed that methanol extract of djulis leaf and seed, GA and GA+6MHO exhibit 100% repellency to F. taiwana at 1% concentration. The repellency of GA and GA+6MHO could even reach 80% at the lowest concentration 0.0016%. The repellent effect could last around 2.5 hr and 3 hr. at the concentration of 1% djulis extract and GA + 6MHO, respectively. 3. To assess the ovipositional attractants, the vapor odors of blue-green algae were identified by using solid phase microextraction (SPME) and gas chromatography - mass spectrometry (GC-MS). The results showed that methylnathlene which was identified from Oscillatoria sp. was the most effective attractants for F. taiwana oviposition (attraction rate 64.0%).
Subjects
Forcipomyia taiwana
algae growth inhibitor
repellent
oviposition attractant
Type
thesis
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