Effects of salicylic acid elicitor against aphids on wheat and detection of infestation using infrared thermal imaging technique in Ismailia, Egypt

Abstract

SUmmARyWheat (Triticum sativum L.) is one of the most important cereal crops in Egypt. Insect pests, such as aphids, are major threats in terms of yield reduction. Induced resistance in wheat using salicylic acid as a foliar application was tested on the farm of the Faculty of Agriculture, Suez Canal University during 2012/2013 and 2013/2014 seasons. Three wheat cultivars, Gemeza 9, Sakha 93 and Giza 168, were sprayed three times with two concentrations of salicylic acid (SA), 200 mg/l and 100 mg/l, after early detection of aphid infestation by infrared thermal imaging.The infrared thermal imaging technique is based on significant differences in surface temperature between infested and healthy leaves. Imaging data are digital, and a computer program can be used to detect infestation rapidly. The results showed that aphid infestation raised the temperature of infested leaves, compared to healthy leaves. The range temperature difference between maximum and minimum temperatures (At) was 1.1 ºC in healthy leaves and 3.9 ºC in infected leaves. The results of SA application showed significant differences in the mean number of aphids and in reduction of infestation among treatments and cultivars. The higher of the two SA rates (200 mg/l) gave higher efficacy in the three cultivars than the lower rate (100 mg/l) over the five weeks of trial. The highest efficacy against aphids was reached one week after application (86.28% for Giza, 85.89% for Gemesa and 70.54% for Sakha). Moreover, SA treatment enhanced the wheat yield of all three cultivars, compared with control plants. The three cultivars (Giza, Gemesa and Sakha) produced higher yields than the control when sprayed with 200 mg/l SA. Their grain yield was 2,491.5, 2,455.0, and 2,327.25 kg/feddan (1 fed = 0.42 ha), respectively. In conclusion, infrared thermal imaging can be employed in identification of infected leaves. Also, the application of SA on wheat induced plant resistance to aphids.

Impact of Fertilization by Using Some Phenolic Compounds and Humic Acid on Marjoram Plants Susceptibility to Insects and Mite Infestation and Plant Features

“…The second season was the opposite of the first season. These results are in agreement with Mahmoud and Mahfouz (2015) results that revealed the foliar spray application of humic acid and salicylic acid reduced the As soon as (Pettersson et al, (1994) reported that cereal crops treated with a slow release formulation of methyl salicylate had been avoided by many insects, (Pickett et al, 2006) showed that salicylic acid caused a reduction in aphid population within five weeks after application.…”

The Influence of Lead on Generation of Signalling Molecules and Accumulation of Flavonoids in Pea Seedlings in Response to Pea Aphid Infestation

“…Additionally, it has been revealed that lead causes an increase in endogenous free SA levels in all organs of Zygophyllum fabago [ 57 ]. The application of SA on wheat induced plant resistance to aphids [ 58 ]. El-Khawas [ 59 ] reported that priming plants with SA induced resistance of crop plants against herbivores, showing it to be successful in Pisum sativum against the leafminer Liriomyza trifolii .…”

Protein Elicitor PeBL1 of Brevibacillus laterosporus Enhances Resistance Against Myzus persicae in Tomato

“…Similarly, analysis of variance showed that nymphal developmental time was prolonged in plants treated with PeBL1 as compared to control. Also at lower temperature (16 • C), maximum nymphal development time was observed, confirming that an increase of one degree in temperature affects the insect's life cycle to become shorter [50]. Further studies are required to understand the underlying mechanism induced by PeBL1 in tomato plants, in particular, concerning its effect on fecundity and nymphal development time.…”