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Year

2014

Title

Mechanism and effectiveness of safflower oil against female Queensland fruit fly Bactrocera tryoni

Source

​Entomologia Experimentalis et Applicata                           Article first published online: 17 JUL 2014DOI: 10.1111/eea.12220


Abstract

​Queensland fruit fly, Bactrocera tryoni (Froggatt) (Diptera: Tephritidae), infests many horticultural fruit crops in the eastern part of Australia. Farmers usually apply synthetic insecticides to control this pest. Little is known on the use of plant products especially vegetable oils for fruit fly control although they are considered to be safer than synthetic insecticides. In this study, safflower oil was investigated for its mechanism and effectiveness against female B. tryoni. In a laboratory test, safflower oil treatments (2.5 and 5.0 ml l−1) reduced the number of fly punctures on treated artificial fruits, no matter whether pre-punctures were present or absent. Safflower oil treatments also reduced the number of fly landings and eggs laid, but only when the treated artificial fruits were without pre-punctures. These results confirmed that safflower oil is active against female B. tryoni mainly by preventing this fruit fly from making oviposition punctures, not by discouraging them from depositing eggs or by repelling them. The slippery nature of safflower oil is considered to be responsible for a reduction in the susceptibility of artificial fruit to fruit fly punctures. Further investigation using fruit-bearing tomato plants (a no-choice test) in a glasshouse situation revealed that safflower oil application at concentrations of 10 and 15 ml l−1 reduced the number of oviposition punctures but failed to reduce the number of eggs laid. To increase efficacy of safflower oil under field conditions, multiple tools may be needed to reduce fruit fly populations and oviposition behaviour, such as the addition of trap-crops, provision of artificial oviposition sites, or mixing the insecticides with the oil.

Authors

Hidayat  ​Y. , Heather N. and E. Hassan

Keywords

  • Carthamus tinctorius ;
  • vegetable oil;
  • slippery;
  • oviposition;
  • punctures;
  • Diptera;
  • Tephritidae

Interest Groups

TWD; TEAM; TWWH; TAAO

Attachments

Created at 24/07/2014 01:19 by Abdeljelil Bakri
Last modified at 24/07/2014 01:19 by Abdeljelil Bakri