Susceptibility of five cabbage varieties to attack by aphids (Hemiptera: Aphididae) in the Accra plains of Ghana
Susceptibility of five cabbage varieties to attack by aphids (Hemiptera: Aphididae) in the Accra plains of Ghana
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加纳阿克拉平原五个卷心菜品种对蚜虫（半翅目：蚜科）侵袭的易感性
DOI：
10.1007/s12600-020-00863-y
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发表时间：
2021
期刊：
影响因子：
1.4
通讯作者：
Adenka K
中科院分区：
文献类型：
--
作者：
Adenka K
我们调查了五个卷心菜品种（“Oxylus”、“Super Cross”、“Vantar F1 Hybrid”、“Santa”F1 和“Fortune”）对蚜虫的敏感性。 2017 年在阿克拉平原进行了两个雨季的试验。第一个试验检查了蚜虫侵扰，第二个试验包括在第二个雨季期间每周按 0.48 L/ha（60 ml/15 L 水）全面喷洒印楝油。对每块地的五片卷心菜叶子进行系统采样，检查蚜虫和相关天敌（捕食者）的数量。还记录了蚜虫侵袭的症状（侵染的发生率和严重程度）。Lipaphis erysimi fakebrassicae（Davis）和Myzus persicae（Sulzer）（半翅目：蚜科）是观察到的两种蚜虫，在第一次试验期间，两个季节的品种之间的数量差异显着，但在第二次试验中则不然。很少有蚜虫定居在“Oxylus”上，而更多的蚜虫则出现在“Fortune”上。L. e.拟甘蓝是所有品种中数量最多的蚜虫。施用印楝后，蚜虫数量显着减少。除主要雨季的蜘蛛外，品种间天敌的出现情况没有显着差异。第一季各品种的蚜虫侵染情况没有显着差异，全部品种均完全死亡，第二季蚜虫发生率和侵染严重程度以‘财富’最高，‘奥克西鲁斯’受蚜虫侵害最少。如果没有对所有品种进行保护，第一季作物产量为零。然而，在第二季，没有保护的卷心菜产量较低（0.19-3.66 吨/公顷），而经过印楝处理的地块产量则高得多（14.8-21.1 吨/公顷）。
We investigated the susceptibility of five cabbage varieties (‘Oxylus’, ‘Super Cross’, ‘Vantar F1 Hybrid’, ‘Santa’F1 and ‘Fortune’) to aphids. Trials were set up in the Accra plains for two rainy seasons in 2017. The first trial examined aphid infestation and the second included weekly blanket spray of neem oil at 0.48 L/ha (60 ml/15 L water) during the second rainy season. Five systematically sampled cabbage leaves per plot were examined for the numbers of aphids and associated natural enemies (predators). Symptoms of aphid attack (incidence and severity of infestation) were also recorded.Lipaphis erysimi pseudobrassicae(Davis) andMyzus persicae(Sulzer) (Hemiptera: Aphididae) were the two aphid species observed and their numbers differed significantly between varieties in both seasons during the first but not the second trial. Few aphids settled on ‘Oxylus’, while more occurred on ‘Fortune’.L. e. pseudobrassicaewas the most abundant aphid on all the varieties. Aphid numbers were significantly decreased by neem application. Occurrence of natural enemies did not differ significantly between varieties, except for spiders during the major rainy season. There was no significant difference in aphid infestation between varieties during the first season as all of them completely succumbed to the infestation, while in the second season aphid incidence and severity of infestation was highest on ‘Fortune’, with ‘Oxylus’ being the least attacked by aphids. The crop yield was zero during the first season without protection for all the varieties. However, in the second season, lower yields (0.19–3.66 t/ha) was obtained with cabbage without protection, and much higher yields (14.8–21.1 t/ha) were obtained on neem-treated plots.
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