chlorosis

Chlorosis, yellowing of leaves, gummosis and necrosis are some of the diseases found in plants because of deficiency of micronutrients.

The -N treatment reduced plant growth and showed leaves with chlorosis throughout the leaf blade (Figures 1A and 2C).

How is it spread and what preventive measures can farmers take?Its symptoms include severe chlorosis or loss of green colouration on leaves and their mottling.

Chlorosis induced by iron (Fe) deficiency is common in plants grown in arid regions (Rombola and Tagliavini, 2006).

Phytotoxicity was ranked weekly for 4 wk using the following categories: chlorosis, chlorotic flecking, necrotic flecking, holes, tip chlorosis, and tip necrosis.

The symptoms of potassium deficiency in the plants consisted of mature leaves becoming opaque green, with dark punctures in the borders of the leaf limbs, followed by chlorosis, and intense necrosis (Figure 1c).

Chlorosis is the yellowing of leaves caused by a decrease in the amount of chlorophyll (green pigment) in the leaves.

The most visible external signs are canopy chlorosis, drought, and fall of pine needles, resin beads, and adult emergence holes.

Plants may develop chlorosis, however, if grown in very alkaline soil.

Leaf chlorosis, an important trait for nitrogen diagnosis, is traditionally measured by assessing leaf colour at a certain stage [19], but the development of chlorosis, which carries valuable information, is difficult to quantify with intermittent information.

Disease was recorded using 0-4 infection scale [14]: (0) no uredia or other macroscopic sign of infection, (;) no uredia, but hypersensitive necrotic or chlorotic flecks present, (1) small uredia surrounded by necrosis, (2) small to medium uredia often surrounded by chlorosis; green islands may be surrounded by chlorotic or necrotic border, (x) random distribution of variable-sized uredia on single leaf, (3) medium sized uredia that may be associated with chlorosis, and (4) large uredia without chlorosis.