TABLE 57 Various cases of gummy bark in sweet orange in southern Yemen
Classification of gummy bark variety | Sweet orange variety | Scion bark | Stock bark | Bud-union crease | ||||
Gum | Pegs | Pinholing | Gain | Pegs | ||||
Sweet orange bark with mild to moderate gum impregnation | Rootstock is not | Unrecorded affected (sour orange) | + | + | - | - | - | - |
No scaling of sweet orange bark | No bud-union crease | Hamlin | + | + | + | - | - | - |
Rootstock is affected (rough lemon) | Valencia late | + | + | ++ | +++ | ++ | +++ | |
Hamlin | + | + | + | + | ++ | |||
Valencia late | ++ | + | + | + | ++ | + | ||
Bud-union crease | Valencia late | ++ | + | + | ++ | ± | ||
Sweet orange bark with severe gum impregnation | Rootstock is not affected (sour orange) | Washington navel | ++++ | ++ | + | - | ± | - |
Hamlin | +++ | + | - | ± | - | |||
Aboussoura navel | +++ | + | - | - | - | |||
Roughness or scaling of sweet orange bark | No bud-union crease | Unrecorded | +++ | + | +++ | - | - | - |
Washington navel | ++++ | + | +++ | - | - |
Key:
- no symptoms;
+ mild symptoms;
++ moderate symptoms;
+++ severe symptoms;
++++ very severe symptoms.
TABLE 58 Virus and virus-like diseases and fungal diseases in southern Yemen
Citrus areas and orchards |
Psyllid vector of greening |
Stubborn |
Gummy bark of sweet orange |
Cachexia of mandarin |
Bark gumming of grapefruit (Kassala disease) |
Psorosis young leaf symptoms |
Concave gum |
Scaly bark psorosis |
Phytophthora gummosis |
Rio Grande gummosis |
Sphaeropsis knot |
Boron toxicity |
Mukayras area | +++ | |||||||||||
Jawl Madrum area | +++ | +++ | ||||||||||
Mudia-Lawdar area | ||||||||||||
Mudia nursery | + | +++ | +++ | +++ | ++ | +++ | ||||||
El Hayed orchard | + | +++ | +++ | ++ | ++ | ++ | ||||||
H. Al Khader orchard | +++ | +++ | ||||||||||
A. Ruwais orchard | +++ | |||||||||||
A. Rabbash orchard | +++ | |||||||||||
M.S. Al Daker orchard | +++ | +++ | +++ | |||||||||
A. Hosein orchard | +++ | +++ | +++ | |||||||||
Lawdar nursery | + | +++ | +++ | + | +++ | +++ | + | +++ | +++ | |||
Say'un-Tarim area | ||||||||||||
Snahuh orchard | +++ | |||||||||||
Jaima farm | + | +++ | +++ | +++ | ||||||||
Al Radod orchard | +++ | +++ | ||||||||||
Quasr Al Qubba orchard | +++ | +++ | ||||||||||
Zinjibar-Gaar area | ||||||||||||
A. Mohson orchard | +++ | +++ | ||||||||||
Fourth Conf. orchard | +++ |
Key:
+ disease is of little importance;
++ disease is of moderate importance;
+++ disease is of great importance.