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Taiwan Agricultural Research Institute, Council of Agriculture, Executive Yuan--Research units-Applied Zoology Division-Beneficial Insect Laboratory-Achievements

Achievements

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The utilization of “Plant oils mixture”

“Plant oils mixture” is a recently achievement of TARI, it showed good control efficacy against some key pests of crops, such as Tetranychus urticae Koch, Aphis gossypii Glover, and Bemisia argentifolii Bellows & Perring, etc. (Fig 1). There were three firms (Table 1) had been authorized for its preparation technology. The relative information can be found on TARI web site, http://www.tari.gov.tw.

Tactics in utilization:

1. Tactics: According to the dynamics of pest population monitored, the frequency and concentration of “Plant oil mixture” application should be regulated. In general, a 300-400 folds water solution can be weekly used if the mites unfound or very low density. This is a prevent action for decreasing mites population and synthetic acaricides used. However, 200 folds solution and 2 sprays a week should be recruited if mites population density is increased.

2. Integrated control: “Plant oil mixture” can be integrated into IPM. The better effect on above pests control will be showed in piper house cultivation.

The cautions:

1. The pest body must be fully covered with “Plant oil mixture” spray, because suffocation may be the lethal mechanism of “Plant oil mixture”. Therefore, the habitat of mites is key point for spray, such as the under-face of leaf, depressions of leaf veins, etc.

2. Avoid phytotoxicity: A phytotoxicity test must be conducted before formal application. A little mount of young shoots, flowers or young fruits sprayed with a 100 fold solution of “Plant oil mixture”, after 48 hrs at least, check any harmed traces. “Plant oil mixture” can be allowed to use only if there is no phytotoxicity confirmed.

Fig. 1. Aphis gossypii (left), Tetranychus urticae (middle), and Bemisia argentifolii (right) killed by treating with “Plant oil mixture” solution.
Fig. 1. Aphis gossypii (left), Tetranychus urticae (middle), and Bemisia argentifolii (right) killed by treating with “Plant oil mixture” solution.