مقایسه شاخص مقاومت چند رقم زراعی سیب زمینی نسبت به سوسک کلرادوی سیب زمینی، Leptinotarsadecemlineata (Say) (Col.:Chrysomelidae)

نوع مقاله : مقالات پژوهشی

نویسندگان

1 دانشگاه آزاد اسلامی واحد مهاباد

2 دانشگاه محقق اردبیلی

3 دانشگاه ارومیه

چکیده

به منظور مقایسه شاخص مقاومت گیاه (PRI) در 33 رقم زراعی سیب زمینی نسبت به سوسک کلرادوی سیب زمینی، Leptinotarsadecemlineata(Say) آزمایش هائی در سال های 1386 و 1387 در مزرعه و گلخانه در شهرستان نقدهانجام گرفت. در آزمون انتخابکه در شرایط مزرعه انجام شد، تعداد حشرات کامل جلب شده به هر رقم برای تعیین شاخص آنتی زنوز استفاده شد. همچنین میزان تلفات دوره های لاروی و شفیرگی آفت روی ارقام مختلف در شرایط گلخانه ای برای محاسبه شاخص آنتی بیوز مورد استفاده قرار گرفت. برای تعیین شاخص تحمل ارقام،طی دو سال زراعی هر سال دو آزمایش مزرعه ای تیمار و شاهد در قالب طرح بلوک های کامل تصادفی طراحی شد. در دوره های رشدی معین تعداد 40 عدد لارو متوسط (سن 2 و اوایل سن 3) روی هر بوته در آزمایش تیمار رهاسازی شد. در آخر فصل زراعی غده های تولیدی در بلوک های تیمار و شاهد برداشت شدو میزان کاهش عملکرد هر یک از ارقام نسبت به شاهد تعیین و شاخص تحمل محاسبه شد. برای تمام ارقام مورد بررسی در هر سال شاخص مقاومت نسبت به سوسک کلرادوی سیب زمینی تعیین شد. در سال 1386 ارقامدلیکات، بریجتوکاردینال به ترتیب با شاخص مقاومت 63/52، 30/36 و 87/29 مقاوم ترین و ارقام دیامانت، آپارت وولوکس به ترتیببا شاخص مقاومت 90/1، 06/2 و 26/2 حساس ترین ارقام مورد بررسی در مقابل سوسک کلرادوی سیب زمینی بودند. در سال 1387 نیز ارقامسانتانا، بریجتوسینجابه ترتیب با شاخص مقاومت 56/48، 36/28 و 80/25 مقاوم ترین و ارقام ولوکس، آگریاو برایتبه ترتیب با شاخص مقاومت 95/1، 71/2 و 20/3 در بین 33 رقم مورد بررسی حساس ترین ارقام به سوسک کلرادوی سیب زمینی بودند.

کلیدواژه‌ها


عنوان مقاله [English]

Comparison of Resistance Index Some Potato Cultivars to the Colorado Potato Beetle, Leptinotarsa decemlineata (Say) (Col.: Chrysomelidae)

نویسندگان [English]

  • A. Ghassemi-Kahrizeh 1
  • Gh. Nouri-Ganbalani 2
  • N. Shayesteh 1
  • I. Bernousi 3
چکیده [English]

Introduction: Potato, Solanum tuberosum L. is an important crop with 5.24 million tons of production on 210,000 hectares of irrigated land in Iran. Several pests attack the potato crop which among them the Colorado potato beetle, Leptinotarsa decemlineata (Say), is the most important defoliating pest of potato throughout the world and Iran and considerably reduce crop yield. Growers rely on pesticides to control this pest in the field but this insect is well known for its rapid resistance development to pesticides, so that it has developed field resistance to nearly all insecticides used against it and it is now resistant to more than 40 chemical insecticides. The problems of insecticide resistance, combined with continuing environmental concerns associated with chemical pesticide use, have provided a considerable stimulus over the past 50 years for the development of alternative control methods. Host plant resistance is considered to be an important part of integrated pest management (IPM) system of this pest, which is compatible with sustainable control methods and can reduce the use of chemical insecticides .With the aim of identifying the existence of resistance resources, a study was conducted to evaluate and comparison the resistance index (PRI) of 33 potatocultivarsto the Colorado potato beetle. Detected resistant variety (ies) could be used as a resistance source for IPM programs of this pest.
Materials and Methods: Greenhouse and field experiments were conducted to compare resistance index (PRI) of 33 potato cultivars to the Colorado potato beetle, Leptinotarsa decemlineata (Say), in Naghadeh region during 2007-2008. In a choice test, the numbers of attracted beetles to each cultivar was determined as antixenosis index in the field. Also, Percentage of larval and pupal mortality were determined and used as the antibiosis index under greenhouse conditions. To evaluate the tolerance index, infested and non infested plots were planted and arranged based on a randomized complete block design under field conditions. In infested plots, each plant was infested by 40 medium larvae (second and early third instars) 15 days prior to the blooming of plants. At the end of season, yield loss in infested plots were determined and compared with non infested plots for each cultivar and used as the tolerance index. Normalized values for each category were computed on a zero-to-one scale by dividing the mean value of each variety evaluated by the maximum mean value of all entries. Normalized tolerance values were calculated as percent reductions of plant biomass relative to a non-infested control. Normalized indices for antibiosis (X), antixenosis (Y) and tolerance (Z) were used to calculate PRI in the formula: PRI = 1/(XYZ) (Inayatullah et al., 1990).
Results and Discussion: Combined analysis of variance showed that interactive effect of cultivar × year was significant for all of the indices at P=0.01. The cultivars Sinja, Bridjet and Cardinal with the least antixenosis index (Y), had the highest antixenosis resistance to the Colorado potato beetle in 2007, also the cultivars Cardinal, Carlita and Elles with the least antixenosis index (Y), had the highest antixenosis resistance to the pest in comparison to other cultivars in 2008. The highest antibiosis (X) resistance was observed in the cultivars Delikat, Carlita, Armada and Sinja with the least antibiosis index, in two studied years. The cultivars Satina, Cardinal, Santana and Nicola with the least tolerance index (Z), had the highest tolrence to the Colorado potato beetle in comparison to the other cultivars during 2007-2008. The cultivars Delikat,Bridjet and Cardinal ere the most resistant cultivars with 52.63, 36.30 and 29.87 PRI, respectively in 2007. In this year, the cultivars Diamont, Aparet and Velox were the most sensitive cultivars with 1.90, 2.06 and 2.26 PRI, respectively in comparison to other cultivars. In 2008, the cultivars Santana, Bridjet and Sinja were the most resistant cultivars with 48.56, 28.36 and 25.80 PRI, respectively and the cultivars Velox, Agria and Bright were the most sensitive cultivars with 1.90, 2.71 and 3.20 PRI, respectively in comparison to the other cultivars in 2008.
Conclusion: Significant positive correlation was observed between the plant resistance indices (PRI) in two study years (r= 0.499, P= 0.01). Results of this research revealed that the cultivars Bridjet, Delikat, Cardinal, Carlita, Sinja and Nicola with the highest PRI were the most resistant cultivars to the Colorado potato beetle in comparison to other cultivars during 2007-2008, suggesting that these cultivars can be used in the IPM program of the pest and resistance transfer to high yield varieties through plant breeding programs.

کلیدواژه‌ها [English]

  • Antixenosis
  • Antibiosis
  • Tolerance
  • Plant resistance index
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