Diseases of citrus a. Gummosis: Phytophthora spp b. Bacte | Agriculture Exams Library
Diseases of citrus
a. Gummosis: Phytophthora spp
b. Bacterial canker: Xanthomonas compestris p.v citri. (transmitted by leaf minor)
C. Tristeza: Virus (vector is aphids. Toxoptera sp.)
d. Citrus greening: Earlier Mycoplasma (now causal organism is Ca librobacter, a gram negative, walled, bacteria).
Transmitted by citrus psylla, Diaphorina citri e. Exocortis: Viroids.
Physiological disorder a. Granulation: Due to high temperature & R.H. during ripening. It can be managed by sprayingof lime & application of 2,4-D (@ 12 ppm)
b. Exanthema: Copper deficiency.
c. Yellow leaf of citrus: Mo deficiency.
d. Die back due to: Cu deficiency
e. Little leaf Cu deficiency
Insect-pest of citrus
a. Psylla: Diaphorina citri (vector of greening disease).
b. Leaf minor: Phyllocnistis citrella (vector of citrus canker)
c. Aphids: Toxoptera auranti (vector of Tristeza disease)
d. Lemon butterfly: Pupilo demoleus. (Controlled by bagging of fruits)
e.Fruit sucking moth: Othreis fullonica (only adult suck the juice from ripening fruits)
