ECOLOGICAL STUDY AND SUSCEPTIBILITY OF SOME APPLE VARITIES TO ATTACK BY Dysaphis reaumuri and Dysaphis pyri

Al-Mallah, Nazar M.; Mohammed, Haitham S.; Obada, A.

doi:10.33899/magrj.2013.81131

Cited by 2 publications

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“…A high insect density of 857.33 insects/tree was observed in one orchard and 33.41 insects/tree in the other orchard within the research area. In a study conducted by Al-Mallah et al, [30] to determine the impact of some environmental factors (biotic and abiotic) on the seasonal activity and population density of the apple leaf-curling aphids Dysaphis pyri and Dysaphis reaumuri, the results revealed that temperature had an impact percentage of 33.1%, while relative humidity had an impact percentage of 36.4%. The most influential factor on aphids was rainfall, with an impact percentage of 66.6%.…”

Section: The Population Density Of the Rosy Apple Aphid Dysaphis Plan...mentioning

confidence: 99%

Seasonal Abundance of Aphids on Apple Cultivars and Their Chemical Control

Ahmed,

Al-khazraji

2024

IOP Conf. Ser.: Earth Environ. Sci.

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The study was conducted out in one of the apple orchards in Baghdad Governorate, Iraq, which is planted with local apple cultivars Kofi, Sharabi and Al-Rahbi, to study the population densities of the green apple aphid (Aphis pomi) and the rosy apple aphid (Dysaphis plantaginea) and to evaluate some chemical pesticides to combat them. The results indicated the appearance of the first green apple aphid A. pomi. It was at the end of October on the Kofi cultivar, and the first appearance of A. pomi on the Sharabi and Al-Rahbi cultivars was in the second week of December, and the highest infection rate was in the first week of May with a population density of 59.10, 50.65 and 16.25 nymphs. /leaf and 5.82, 6.22 and 1.48 adults/leaf and respectively for the three above-mentioned cultivars, while the first appearance of the rosy apple aphid D. plantaginea was in the first week of March on the Kofi cultivar, while the first appearance of D. plantaginea on the Sharabi and Al-Rahbi cultivars It was in the third week of March, and the peak infestation reached in the fourth week of April, with a population density of 81.89 and 60.59 nymphs/leaf and 9.88 and 7.16 8 adults/leaf for both the Kofi and Sharabi cultivars, respectively, and for the Al-Rahbi cultivar, the first appearance was in the week. The third of April, with a rate of 8.24 nymphs/leaf and 0.97 adults/leaf. The results indicated that the Kofi apple trees were the most susceptible to infection compared to the rest of the cultivars, while the Al-Rahbi cultivar was the most resistant to aphid infestation. The results of evaluating the effectiveness of the pesticides Arando, Nestor and Oxymatrine in reducing the population density of the green apple aphid (Aphis pomi) and the rosy apple aphid (Dysaphis plantaginea) also indicated that the pesticide Arando was superior to the rest of the pesticides in combating the insect A. pomi and the relative effectiveness rate reached 72.39% compared to the two pesticides Nestor and Oxymatrine. Oxymatrine, the relative effectiveness of which reached 63.32 and 58.20%, respectively. As for the relative effectiveness of the pesticides on D. plantaginea, it reached an average of 85.77, 88.23, and 94.36% for Oxymatrine, Arando, and Nestor, respectively. Nestor was superior to the rest of the pesticides in Control of D. plantaginea insect.

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Section: The Population Density Of the Rosy Apple Aphid Dysaphis Plan...mentioning

confidence: 99%

Seasonal Abundance of Aphids on Apple Cultivars and Their Chemical Control

Ahmed,

Al-khazraji

2024

IOP Conf. Ser.: Earth Environ. Sci.

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“…The Ziziphus spina-christi tree is multi-purpose, its fruits contain a high percentage of vitamin C, in addition to sugars, proteins, organic and amino acids, fats and mineral salts, and its leaves and bark have medicinal properties. Ziziphus spina-christi cultivation is widespread in the central and southern regions of Iraq, especially in Basra Governorate / Iraq [3]. However, neglect and poor service increased the disease and insect problems of these trees.…”

Section: Introductionmentioning

confidence: 99%

The First Recording of Blue Pea Butterfly, Lampides boeticus L. on Ziziphus Spina-christi Trees in Nineveh Governorate

Al-Jalal,

Yahya

2023

IOP Conf. Ser.: Earth Environ. Sci.

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The larvae of the blue pea butterfly, Lampedies boeticus L., were observed for the first time feeding on Ziziphus spina-christi leaves in 2020 in the gardens of Mosul University / Nineveh Governorate. The larvae feed on the lower surface layer of the leaves, leaving the feeding places in the form of transparent linear spots. The leaf may be stripped of its green area when the infection intensifies and eventually leads to its fall. The rate and severity of leaf injury varied during the months of the year and reached its peak in November with an average of 61.42% and 20.06 linear/leaf spots, respectively, while the injury rate of leaf and severity were the lowest in May with an average of 2.47%, 0, 61 linear spots/leaf. The results also showed that the southern and eastern directions of the tree were the most preferred for the insect, as the average rates of leaf infestation were 22,84, 22.12%, respectively. The mid-site leaves on the stem were the most affected by the feeding of butterfly larvae, with a severity of 7.08 linear spot/leaf.

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ECOLOGICAL STUDY AND SUSCEPTIBILITY OF SOME APPLE VARITIES TO ATTACK BY Dysaphis reaumuri and Dysaphis pyri

Cited by 2 publications

References 0 publications

Seasonal Abundance of Aphids on Apple Cultivars and Their Chemical Control

Seasonal Abundance of Aphids on Apple Cultivars and Their Chemical Control

The First Recording of Blue Pea Butterfly, Lampides boeticus L. on Ziziphus Spina-christi Trees in Nineveh Governorate

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