Effect of controlling Colletotrichum leaf fall of rubber tree on epidemic development and rubber production

Guyot, Jean; Omanda, Edith Ntawanga; Ndoutoume, Auguste; Otsaghe, Abd-Allah Mba; Enjalric, Frank; Assoumou, Henri-Grégoire Ngoua

doi:10.1016/s0261-2194(01)00027-8

Cited by 32 publications

(21 citation statements)

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“…Consequently, the susceptibility of these clones needs to be assessed over a few years, until the natural defoliationrefoliation process has become established. The role of phenology is well known for other leaf diseases, such as secondary leaf fall due to Colletotrichum gloeosporioides (Guyot et al 2001).…”

Section: Discussionmentioning

confidence: 99%

Assessing resistance of rubber tree clones to Microcyclus ulei in large-scale clone trials in Ecuador: a less time-consuming field method

et al. 2009

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Resistance of rubber tree clones to South American Leaf Blight (SALB) caused by the fungus Microcyclus ulei is normally assessed in specific large-scale clone trials, which in general entail a considerable amount of work. Four variables are observed monthly on each tree over many years: disease severity and conidial sporulation intensity on young leaves, and severity and stroma density on mature leaves. In order to simplify this field assessment method, we tested the resistance of eight rubber tree clones to M. ulei in Ecuador in a Fisher block design with four replicates per treatment. Three months after planting, monthly observations were made for a period of 12 months on the foliage focusing on the four variables, in order to quantify disease development. Given the correlations between the four variables, assessment of conidial sporulation intensity on young leaves and stroma density on mature leaves should be sufficient. The most suitable period to start the assessment was 6 months after planting, for a duration of six to nine months. As repeated observations on the same trees were autocorrelated, it was possible to reduce the assessment frequency to once every 2 months. To conclude, assessing the resistance of rubber tree clones to SALB in large-scale clone trials can be optimized to reduce the number of observation times by 50%.

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Section: Discussionmentioning

confidence: 99%

Assessing resistance of rubber tree clones to Microcyclus ulei in large-scale clone trials in Ecuador: a less time-consuming field method

et al. 2009

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“…Indeed, it is well known that the defoliation-refoliation behaviour plays a major role in some leaf diseases, such as secondary leaf fall due to Colletotrichum gloeosporioides (Rao and Azaldin 1973;Sénéchal 1986;Guyot et al 2001). The observations made by Medeiros (1976), Furtado (1990) and Rivano (1992) indicated that the same applied to SALB.…”

Section: Discussionmentioning

confidence: 99%

Influence of host resistance and phenology on South American leaf blight of the rubber tree with special consideration of temporal dynamics

Guyot¹,

Cilas²,

Sache

2007

Eur J Plant Pathol

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South American leaf blight (SALB), the most dangerous disease of the rubber tree, is responsible for the lack of significant natural rubber production in South America and is a major threat to rubber tree plantations in Asia and Africa. Although the selection of resistant clones is the preferred disease control method, greater knowledge is required of the relationship between host and pathogen, in order to construct more durable resistance. Based on small-scale trials, this study set out to compare the dynamics of SALB on two highly susceptible and one moderately susceptible clone and to analyse the effect of host phenology on disease severity, at leaflet and flush scales. Clonal resistance was found to have a noticeable effect on disease severity, asexual sporulation and stromatal density at both leaflet and flush levels, and on disease dynamics at a leaflet level; time for symptom and sporulation appearance were longer on the moderately susceptible clone than on the susceptible clones. On the moderately susceptible clone, the stromatal density was largely dependent on disease severity. The phenology did not differ among the three clones and could not be considered as a factor in genetic resistance to SALB. However, for the three clones, the position of the leaflet in the flush affected the duration of the immature stages and the disease: the shorter the duration of leaflet development, the lower the disease severity, the sporulation intensity and the stromatal density.

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“…To control the rubber leaf disease of Colletorichum and reduce the inoculum on the overwinter leaves, Guyot et al (2001) recommended to use artificial defoliation and this approach has also been highly recommended to control the powdery mildew disease in China (Yu and Wang, 1988;Yu et al, 1980;Yu et al, 1985).…”

Section: Discussionmentioning

confidence: 99%

The powdery mildew disease of rubber (Oidium heveae) mainly controlled by the winter temperature in the Xishuangbanna, China

Zhai¹,

Thaler

Luo

et al. 2019

Preprint

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Background: Rubber powdery mildew disease (Oidium heveae) is a serious threat to the natural rubber production in some rubber developing regions of the world. Many factors affect the powdery mildew disease. As many of these influencing factors found in previous studies are strongly correlated, unraveling their effects and their relative importance is a challenge. We assessed the three main groups of factors: temperature variables, the timing of leaf phenologies, and the duration of leaf development. In total, we investigated the effects of forty-one factors on the infection rate of powdery mildew of rubber trees (Hevea brasiliensis) by using Partial Least Squares (PLS) regression methods over 9-year records (2003–2011). Results: Among these factors, we found that the most influential variables were the temperature variables (winter and spring mean temperature, and daily temperature differences in winter) and the duration of leaf development to maturation, from copper brown stage to leaf aging, which explained 72% and 58% of the variations in the infection rate. We found the controlling role of winter mean temperature, for the first time, on the infection rate of powdery mildew, and the duration of leaf maturation was also influenced by the winter mean temperature. Conclusions: The controlling role of winter temperature may have directly increase the infection rate when winter temperature is high, and indirectly increase the infection rate through the prolongation of the leaf maturation duration, although the duration itself, from copper brown to leaf aging had smaller influences. We detected a warming trend of the winter temperatures from 2003 to 2011, which indicates that the rubber plantations will experience increasing of infection rate of powdery mildew if the winter warming continues.

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Effect of controlling Colletotrichum leaf fall of rubber tree on epidemic development and rubber production

Cited by 32 publications

References 1 publication

Assessing resistance of rubber tree clones to Microcyclus ulei in large-scale clone trials in Ecuador: a less time-consuming field method

Assessing resistance of rubber tree clones to Microcyclus ulei in large-scale clone trials in Ecuador: a less time-consuming field method

Influence of host resistance and phenology on South American leaf blight of the rubber tree with special consideration of temporal dynamics

The powdery mildew disease of rubber (Oidium heveae) mainly controlled by the winter temperature in the Xishuangbanna, China

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