Aesculus x carnea - natural resistance??

[elicokiz]

Hi Folks

was busy carrying out a plant ident lesson and suddenly had one of those ureka moments? was discussing Cameraria and spotted that a A. hippocastanum was covered in miner and the ajoining A. carnea was completely free from infection ...is this unusual??? as one of A. carnea's parents is good ol horse chestnut i was rather stumped?:blushing:has anyone seen infection on any other species of Aesculus??

 

regards

Dave:thumbup:

[Andy Collins]

So far I have found that carnea are more resistant to the miners, but maybe they will evolve in time. Dunno the answer really.

[rupert]

An extract from my dissertation:

 

Although A. hippocastanum is the principal host of C. ohridella in Europe, many other Aesculus species are also susceptible. A. turbinata (Japanese Horse chestnut) is highly susceptible, and species from North America, such as A. californica (California Buckeye), A. flava, A. glabra (Ohio Buckeye), A. parviflora, A. pavia (Red Buckeye), and A. sylvatica (Painted Buckeye) are moderately susceptible (Freies et al., 2004). In contrast, other species from Asia, such as A. assamica (East Himalayan Horse chestnut), A. chinensis (Chinese Horse chestnut) and A. indica, are generally resistant (Straw and Tilbury, 2006). A. x carnea is highly resistant to C. ohridella, killing the larvae in the first or second instar (Freies et al., 2004). The majority of other Aesculus hybrids are derived from crosses between A. flava, A. glabra, A. pavia and A. sylvatica (Bean, 1970; Daniels, 1984; Huxley, 1999). Susceptibility to C. ohridella varies from moderately susceptible in A. x bushii to highly resistant in A. x neglecta (Straw and Tilbury, 2006). C. ohridella has also been reported to damage Acer platanoides (Norway maple) and Acer pseudoplatanus (Sycamore) (Gregor et al., 1998; Straw and Tilbury, 2006). This host range expansion is expected to increase further, threatening many other trees (CONROCAM, 2004).

[Andy Collins]

Wow useful info there Rupert:thumbup:

[elicokiz]

An extract from my dissertation:

 

Although A. hippocastanum is the principal host of C. ohridella in Europe, many other Aesculus species are also susceptible. A. turbinata (Japanese Horse chestnut) is highly susceptible, and species from North America, such as A. californica (California Buckeye), A. flava, A. glabra (Ohio Buckeye), A. parviflora, A. pavia (Red Buckeye), and A. sylvatica (Painted Buckeye) are moderately susceptible (Freies et al., 2004). In contrast, other species from Asia, such as A. assamica (East Himalayan Horse chestnut), A. chinensis (Chinese Horse chestnut) and A. indica, are generally resistant (Straw and Tilbury, 2006). A. x carnea is highly resistant to C. ohridella, killing the larvae in the first or second instar (Freies et al., 2004). The majority of other Aesculus hybrids are derived from crosses between A. flava, A. glabra, A. pavia and A. sylvatica (Bean, 1970; Daniels, 1984; Huxley, 1999). Susceptibility to C. ohridella varies from moderately susceptible in A. x bushii to highly resistant in A. x neglecta (Straw and Tilbury, 2006). C. ohridella has also been reported to damage Acer platanoides (Norway maple) and Acer pseudoplatanus (Sycamore) (Gregor et al., 1998; Straw and Tilbury, 2006). This host range expansion is expected to increase further, threatening many other trees (CONROCAM, 2004).

 

 

Thanks rupert

thats intresting stuff..must be the saponins within the leaves which have an insecticidal action? had no idea that Cameraria had more than one host Genus ...thats scary stuff ..also shows how useful this forum is for gaining new knowledge

 

regards

Dave:thumbup1:

[Pommie]

I have seen it on Platanus although on minor infestation

[MattyF]

Carnea seems at the moment from what i have seen resistant to leaf miner but not bleeding canker(and hides the syptoms a lot better, untill actual limb failure occurs!!) ..and that i think bleeding canker causes more in terms of future failure not to sudgest either for planting.