Australian Journal of Agricultural Research (2001) 52, 1017-1022

S.L. Willingham, K.G. Pegg, A.W. Cooke, L.M. Coates, P.W.B. Langdon and J.R. Dean (2001)
Rootstock influences postharvest anthracnose development in 'Hass' avocado
Australian Journal of Agricultural Research 52 (10), 1017-1022
Abstract: Rootstock studies conducted on 'Hass' avocado found that rootstock had a significant impact on postharvest anthracnose susceptibility. This is the first record of such an effect for avocado. The severity and incidence of anthracnose was significantly lower on 'Hass' grafted to 'Velvick' Guatemalan seedling rootstock compared with the 'Duke 6' Mexican seedling rootstock. Differences in anthracnose susceptibility were related to significant differences in concentrations of antifungal dienes in the leaves and mineral nutrients in the leaves and fruits from trees grafted to different rootstocks. Leaf diene concentrations were up to 1.5 times higher in 'Hass' trees on the 'Velvick' than the 'Duke 6' rootstock. In ungrafted nursery stock trees, diene concentrations were around 3 times higher in 'Velvick' than 'Duke 6' leaves. The 'Velvick'/'Hass' combination also had a significantly lower leaf N concentration, a significantly higher fruit flesh Mn concentration, and significantly lower and higher leaf N/Ca and Ca+Mg/K ratios, respectively. A significant correlation (r = 0.82) between anthracnose severity and skin N/Ca ratio was also evident.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): S.L. Willingham

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

---

Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Colletotrichum gloeosporioides	Stored fruits/vegetables
	Colletotrichum gloeosporioides	Avocado (Persea americana)