## 4 Discussion
\begin{table}
\begin{tabular}{c c c c c c c c} \hline  & & & & **No. of Females** & & **No. of Males** & \\ \hline
**Serenada** & **Dosage** & **ng min\({}^{-1}\)** & **+ \({}^{\text{th}}\)** & **– \({}^{\text{th}}\)** & **\({}^{\text{th}}\)** & **– \({}^{\text{th}}\)** & **\({}^{\text{th}}\)** \\ \hline Spraying & 1 & 10 & 4 & 16 & 6.05 * (_i_) (\({}^{\text{th}}\)) & 5 & 15 & 4.05 * (_i_) (\({}^{\text{th}}\)) \\ \hline \multirow{3}{*}{Vaporization} & 2 & 100 & 3 & 17 & 8.45 * (_i_) (\({}^{\text{th}}\)) & 4 & 16 & 6.05 * (_i_) (\({}^{\text{th}}\)) \\  & 3 & 10 & 2 & 18 & 11.3 ** (_i_) (\({}^{\text{th}}\)) & 3 & 17 & 8.45 * (_i_) (\({}^{\text{th}}\)) \\ \cline{1-1}  & 4 & 100 & 0 & 20 & 18.5 *** (_i_) (\({}^{\text{th}}\)) & 1 & 19 & 14.45 *** (_i_) (\({}^{\text{th}}\)) \\ \hline \end{tabular}
\end{table} 
Table 5: Effect of volatile odours released by wheat plants cv. Serenada following methyl jasmonate exposure at two levels (10 ng min\({}^{-1}\) and 100 ng min\({}^{-1}\)) on the number of _Aelia acuminata_ L. adult females and males choosing to enter an arm of a four-way olfactometer. One arm contained the combination of odours, whereas the other arm contained purified, humidified air and hexane solvent (no odour) to act as the control. microextraction (SPME) applied in vivo, as presented by [PERSON] et al. [26] for volatiles emitted from grapes during ripening, may also be considered. With regards to VOC emission correlation coefficients, the above discussion explains why our results are contrary to those found in the study by [PERSON] and [PERSON] [4], which reported no correlations for any of the GLVs. The crucial difference in our study is the VOC collection method. [PERSON] and [PERSON] [4] used a sample preparation method that consisted of plant tissue cutting and homogenizing. As mentioned above, this can cause significant differences in VOC release, because the structure of the whole plant tissue is destroyed and hence the VOCs have no barriers to overcome to limit their emission. Using our experimental design, VOC correlations are more reliably evaluated, as illustrated in this work and our earlier works [9; 27; 28]. The correlation coefficients show how mutually related the emitted VOCs are to a plant's natural defence strategies. [PERSON] et al. [29] found that plants respond to stress by releasing biogenic volatile organic compounds (BVOCs). They used a meta-analysis approach and found that there is less variation in the GLV profile than we presumed and that pathogens induce more GLVs than insects and wounding. To prove that the identified and investigated GLVs and other VOCs play a significant role in pest management, experiments with Bishops' Mitre shieldbugs are reported in this paper. Using a four-way olfactometer, both sexes of the insects were found to respond negatively to the VOCs released at a rate of 100 ng min\({}^{-1}\). Attraction was observed only for release rates of 10 ng min\({}^{-1}\) and then only for the \"Kandela\" (spraying) wheat plants. [PERSON] et al. [30] reported that _Ceplus cinctus_ Norton females are attracted to some dose levels of (_Z_)-3-hexenyl acetate, (_Z_)-3-hexenol, and the terpene, (_Z_)-\(\beta\)-ocimene, but are repelled by the highest release rates of (_Z_)-3-hexenyl acetate they tested (8400 ng h\({}^{-1}\)). [PERSON] et al. [31] found that _Fusarium_ infection induces VOC emissions in maize and that adult cereal leaf beetles (_Oulema melanogaster_ L) are attracted to a synthetic blend of volatiles containing two common GLVs, namely (_Z_)-3-hexenal and (_Z_)-3-hexenyl acetate, and two terpenes linalool and \(\beta\)-caryophyllene. [PERSON] and [PERSON] [32] reported repellent effects of five monoterpencids (including R-linalool, which is a natural component of the essential oils of _Aframontum melegeta_ K. [PERSON] and _Zingiber officinal_ [PERSON]) against _Tribolium castaneum_ erbst. and _Rhyzopertha dominic_ ([PERSON]) in a four-way olfactometer study. [PERSON] and [PERSON] [33] showed that linalool, a major volatile constituent in _C.