African Plant Protection (2003) 9, 115-117

W.J. Swart, D. Nieuwoudt and J.C. Pretorius (2003)
Effect of nitrogen on susceptibility of pistachio plants to Botryosphaeria obtusa and B. dothidea in the greenhouse
African Plant Protection 9 (2), 115-117
Abstract: The effect of nitrogen (N) application on the susceptibility of three pistachio rootstock genotypes (Pistacia integerrima, P. terebinthus and Clone II (P. integerrimax P. atlantica)) to Botryosphaeria obtusa and B. dothidea was investigated in the greenhouse. Two rates of limestone ammonium nitrate (28 %) were applied on a weekly basis to two-year-old potted plants for a period of three weeks. One rate was equal to the standard amount of N applied in the orchard, i.e. 7.3 g N per plant per week, and the other to 16.8 g. Plants from each rate of application were subsequently inoculated onto their stems with B. obtusa and B. dothidea, respectively, and the length of resulting cambial lesions was measured after three weeks. Genotypes receiving the higher N rate generally had smaller cambial lesions than those receiving the lower rate. Significant differences between the two N rates were recorded on all three genotypes for B. obtusa, but only on P. terebinthus for B. dothidea.
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Research topic(s) for pests/diseases/weeds:
environment - cropping system/rotation

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Botryosphaeria dothidea	Pistachio nut and relatives (Pistacia)
	Diplodia seriata	Pistachio nut and relatives (Pistacia)