Effects of cis-jasmone and methyl jasmonate treatments on insect pests and beneficial insects fauna of wheat (triticum aestivum l.)

In present study, the effects of three different doses (25 g/ha; 50 g/ha; 100 g/ha) of cis-jasmone and five different doses of methyl jasmonate (0.88 mM; 1.76 mM; 3.55 mM; 7.1 mM; 14.2 mM) on wheat pest insects and their natural enemies were investigated using three different sampling methods (Plant Sampling, sweep-net, sticky traps) during 2011-2013 years. It is found that some or all cis-jasmone doses have statistically important effects on aphid species (Hemiptera: Aphididae), phytophagous thrips species (Thysanoptera: Phlaeothripidae and Thripidae), wheat stem sawfly species (Hymenoptera: Cephidae), coccinellid species (Coleoptera: Coccinellidae), syrphid species (Diptera), aphid parasitoids species (Hymenoptera: Braconidae), wheat stem sawfly parasitoid, Collyria coxator (Hymenoptera: Ichneumonidae) and the green lacewing, Chrysoperla carnea (Neuroptera: Chrysopidae). cis-Jasmone treatments had deterrent effects on aphids, thrips species, wheat stem sawflies and C. carnea while it was attractive for coccinellid species and C. coxator Effects of cis-jasmone treatments on aphid parasitoids and syrphid flies population densities were not significantly different from the control treatments but were varied among cis-jasmone doses. Effects of different doses of methyl jasmonate on aphid species, phytophagy thrips species, wheat stem sawfly species, Coccinellid species, syrphid species, C. coxator, C. carnea and predatory thrips species were found statistically significant. Methyl jasmonate treatments had deterrent effects on aphid species, phytophagous thrips species and syrphid species. At the same time, methyl jasmonate treatments attracted wheat stem sawflies, coccinellid species, C. coxator and C. carnea. There was no effect of methyl jasmonate treatments on aphid parasitoids. Effects of methyl jasmonate treatments on predatory thrips species population density were not significantly different from control treatments but were varied among methyl jasmonate doses. There were no significant effects of cis-jasmone treatments on yield and yield components of wheat while methyl jasmonate treatments lead to wheat yield reductions. Furthermore, cis-jasmone treated plants were taller than those in untreated control plots, but methyl jasmonate applications suppressed length of plants.