Help me to understand this problem in greenhouse eggplant

Eggplant    Italia

Chlorotic leaves with irregular spots; symptoms appear only on older leaves. Percentage/damage about 80% of plants affected in the greenhouse. Night temperature 13-18 ° C, daytime about 28-33 ° C.

Phytophthora infestans?
Phytotoxicity? Excess NaCl?
Nutritional deficiencies? P2O5?


Posted by: Dr. Raffaele Giurato (6 points) Dr. Raffaele Giurato
Posted: September 17, 2016

alex ignatov commented,
Have you applied any insecticides? I had similar symptoms on brassicas after nicotine acid treatment.
about 4 years ago.

Dr. Raffaele Giurato commented,
I have contacted the farmer. Yes, the farmer has made several insecticide treatments but not with nicotinic acid.
about 4 years ago.

alex ignatov commented,
Can you say the class of applied insecticides?
about 4 years ago.

Dr. Raffaele Giurato commented,
The insecticides used by farmers: pyrroles; (high dose; I believe it is the cause) oxadiazine; nereistoxin;
about 4 years ago.


It could be salt stress. Accumulation of excess salt (sodium chloride) in soil resulting in reduced chlorophyll and stunted growth. Symptoms may vary depends on the concentration of salt. Generally salinity stress decreases the water absorption capacity of root systems and leads to water loss from leaves due to osmotic stress.

Poor quality of irrigation water and improper drainage will leads salt toxicity.

Posted by: Dr. Ravishankar Narayana (11 points) Dr. Ravishankar Narayana
Posted: September 19, 2016

Dr. Raffaele Giurato commented,
I also thought as salt stress. I saw accumulation of salts on the hose pipe (image attached). The conductivity is about 3,6 mS/cm (with excess NaCl).
about 4 years ago.

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