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Phytophthora-Diaprepes Weevil Complex: Phytophthora spp. Relationship with Citrus Rootstocks
J H Graham1, D B Bright2, C W McCoy3
1Professor.
Plant Disease
|March 1, 2019
Summary
The Diaprepes abbreviatus weevil larvae damage citrus roots, increasing susceptibility to Phytophthora diseases. Rootstock resistance to specific Phytophthora species is crucial for managing this complex.
Area of Science:
- Agricultural Entomology
- Plant Pathology
- Horticulture
Background:
- Diaprepes abbreviatus, an invasive root weevil, causes significant damage to citrus roots.
- Larval feeding predisposes citrus root systems to infection by Phytophthora species.
Purpose of the Study:
- To evaluate the impact of Diaprepes abbreviatus larval feeding on citrus rootstocks.
- To determine the interaction between root damage and Phytophthora infection in different rootstocks.
Main Methods:
- Infestation of citrus seedlings with varying numbers of Diaprepes abbreviatus larvae.
- Assessment of root damage, sugar leakage, and Phytophthora infection severity.
- Comparison of rootstock responses between trifoliate orange and Cleopatra mandarin.
Main Results:
- Root damage by Diaprepes abbreviatus larvae increased root leakage in both tested rootstocks.
- Phytophthora palmivora infection and root rot were more severe on trifoliate orange and correlated with larval damage.
- Phytophthora nicotianae infection was higher on Cleopatra mandarin, but root rot did not increase with larval damage severity.
Conclusions:
- Citrus rootstock tolerance to the Phytophthora-Diaprepes weevil complex depends on resistance to individual Phytophthora species.
- Phytophthora palmivora requires larval-induced root damage to infect and rot taproots, unlike Phytophthora nicotianae.
- Management strategies should consider specific Phytophthora species' interactions with rootstock resistance and weevil damage.
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