Early Detection of Brown Rust (Leaf Rust) Puccinia recondita in Wheat Plant Using Remote Sensing Techniques

Eyad Ahmad Al-khaled*(1) Basel Al-kai(2) and Asmaa Makdah(2)

(1). General Organization of Remote Sensing (GORS), Damascus, Syria.
(2). Department of Plant Protection, Faculty of Agriculture, Albaath University, Homs, Syria.
(3). (GORS), Homs, Syria.

(*Corresponding author: Dr. Eyad Ahmad Al-Khaled, E-Mail: dr.eyadalkhaled@gmail.com).

Received: 29/6/ 2015                           Accepted: 01/08/ 2015

Abstract

The experiment carried out during 2008-2009 season at Homs; the objective was to study the spectral characteristics of healthy and infected wheat plants with brown rust Puccinia recondita, and the possibility of early detection of this disease before the symptoms appearance of disease on the plants. The spectral characteristics of plants showed significance differences in reflectance values, for both healthy and inoculums plants after one week of artificial inoculation with fungi on 9/4/2009 within wavelength 750-1060 nm of near infrared NIR and short infrared wave SINW. The healthy plants recorded higher spectral reflectance values more than the infected plants in range of spectrum, the spectral reflectance value within the wavelength 790-810 nm was 64.68 % for healthy plants and 60.34 % for infected plants, and these differences in spectral reflectance values were increased between the healthy and infected plants in this spectral range with the appearance of disease symptoms on the infected plants, and with the increment of disease severity of the infected plants. In 21/5/2009 the spectral reflectance values in the wavelength 790-810 nm were 44.22 -33.65 % for healthy and infected plants, respectively. It was found that the differences in spectral reflectance values between healthy and infected plants were clear in the spectral area of near and short infrared, which represented the wavelength 750-1120 nanometers, and the best wavebands for early detection of brown rust disease were within the range 750 – 940 nanometers of the near infrared NIR spectral range. Where significant differences were found in this range after one week of inoculation with fungi or before almost 21 days from symptoms appearance of disease of the infected plants to the end of the growing season.

Key words: Wheat, Leaf rust, Spectral reflectance, Artificial inoculation, Syria.

Full paper in Arabic:

الكشف المبكر عن الصدأ البني (صدأ الورقة) Puccinia recondita على نبات القمح باستخدام تقنيات الاستشعار عن بعد