Optimal timing for IGRs application against Dericorys albidula nymphs

Document Type : Research Paper

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Abstract

Dericorys albidula is one of the most important pests of saxaul trees (Haloxylon spp.) in major saxaul plantation areas of Iran, in particular Isfahan, Semnan, Tehran and Khorasan provinces. Because of regular outbreak of this pest, control measures are carried out annually using phosphorus insecticides, specially fenitrothion.
In order to optimize timing of chemical applications, a field test was conducted in 1996 to 1997 in a randomized complete block designs  with 3 treatments and 3 replications in saxaul plantation of Ardestan. Treatments include 2 formulations of diflubenzuron 45% (oil based and wettable powder) and nomolt (2.5 l/ha as ULV) and water as control.
As nymphs were mobile and move around activity, experiment was performed in. 2×2×2 m cages with an screen iron over saxaul plants treated with chemicals. Twenty five nymphs were released in each cage. The experiment was carried out in two stages: on 2nd and 3rd nymphal stages as first group and 4th and 5th nymphal stages as the second group. Criteria for appraising chemicalls include the effect of compounds on nymphal mortality rate for each treatment.
Samplings were at 5, 10 and 15 days intervals following treatment application and the number of dead nymphs was recorded. Duncan test was conducted to compare average values. Based on the results, mortality rate in the first group for treatments of Oil-Dimilin, Nomolt and Powder-Dimilin at 15 days after operation were 70, 61 and 23 percent respectively. The figures for the second group were 58, 46 and 23 percent respectively. There was significant differences (1%) between treatments and Oil-Dimilin 45% caused the highest mortality. Powder Dimilin showed the least mortality on 2 and 3 as well as 4 and 5 instars nymphs.
 
 

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References

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Iranian Journal of Forest and Range Protection Research
Volume 3, Issue 1
May 2005
Pages 57-68

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History

  • Receive Date: 21 May 2004
  • Revise Date: 12 June 2016
  • Accept Date: 19 February 2005

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