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Within-plant distribution of cotton aphid (Hemiptera: Aphididae) in cotton cultivars with colored fibers Anais da ABC (AABC)
Fernandes,Francisco S.; Ramalho,Francisco S.; Malaquias,José B.; Nascimento Junior,José L.; Correia,Ezequias T.; Zanuncio,José C..
We describe the vertical and horizontal distribution of the cotton aphid Aphis gossypii Glover within a cotton plant in two cotton (Gossypium hirsutum Linnaeus) cultivars (BRS Safira and BRS Rubí) with colored fiber over the time. Measurements of aphid population dynamics and distribution in the cotton plants were recorded in intervals of seven days. The number of apterous or alate aphids and their specific locations were recorded, using as a reference point the location of nodes on the mainstem of the plant and also those on the leaves present on branches and fruit structures. The number of apterous aphids found on the cultivar BRS Safira (56,515 aphids) was greater than that found on BRS Rubí (50,537 aphids). There was no significant difference between...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Aphis gossypii; Behavior; Cotton with colored fibers; Distribution.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652012000300013
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Effect of temperature on the reproduction of Bracon vulgaris Ashmead (Hymenoptera: Braconidae), a parasitoid of the cotton boll weevil Anais da ABC (AABC)
Ramalho,Francisco S.; Wanderley,Paulo A.; Malaquias,José B.; Fernandes,Francisco S.; Nascimento,Antônio R.B.; Zanuncio,José C..
This research studied the effect of temperature on the reproduction of Bracon vulgaris Ashmead, an ectoparasitoid of cotton boll weevil ( Anthonomus grandis Boheman) at constant temperatures of 20, 25 and 30ºC, 70 ± 10% RH and a photophase of 14 h. Females of the parasitoid produced a greater number of eggs when exposed to 25ºC (124.65 eggs) in relation to those exposed to 20 (43.40 eggs) and 30ºC (49.60 eggs). The number of parasitized larvae per female of B. vulgaris at 25ºC (71.75) was greater than at 20ºC (31.40) and 30ºC (25.15). The daily intrinsic rates of increase (r m) were - 0.007 at 20ºC, 0.07 at 25ºC and 0.03 at 30ºC, revealing that the temperature of 25ºC produced increases of 1,100 and 133% in the value r m in relation to temperatures of 20...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Ectoparasitoid; Anthonomus grandis Boheman; Biology; Life and fertility tables.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652011000300020
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