Factors and conditions that cause the growth and pistachio shell increase of psyllid population in gardens:
Execution of the first time spraying or spraying at the time of flowering: This spraying is done against pests such as pistachio wood-eating moths, fruit-eating moths, pistachio weevils, chanterelles (juicy), etc. If toxins are used in this spraying that do not affect the psyllid pest, it will increase the resistance and growth of the psyllid population.
If a toxin is used for the first time that stimulates the spawning of the psyllid and shortens the duration of a generation (such as thiodicarb, metacystox and fention), the psyllid will erupt.
Frequent spraying and mixing of toxins together, which completely eliminates natural enemies and increases the population of pistachio pests.
If pesticides are used against pistachio psyllids that do not have a sufficient effect on pest mortality (such as zolone), it will increase the population.
If the garden is sprayed at a time when all stages of the pest life, including eggs, purees and insects are seen and also a lot of sugar is produced on the surface of the leaves, the effect of the pest will decrease and after a while the pest population will increase. Slowly
Excessive use of nitrogen chemical fertilizers, especially urea and ammonium sulfate in the warm months of the year at the plot levels, as well as chloropotassium fertilizer, provide the conditions for population growth.
The use of poultry manure alone and in large quantities also increases the population of psyllids.
Poor soil in terms of nutrients and unsuitable soil texture are also factors in population growth, sandy soils and clay and hard soils due to lack of moisture absorption and maintenance due to long irrigation period faster contaminated with pests گردند.
The uneven surface of the plots, which means that the trees at high altitudes are not well irrigated and have less moisture.
Do not use manure, plowing and deep plowing in gardens for a long time.
Dense planting of trees and not observing proper distances and pruning operations.
Existence of many weeds in the garden from June onwards.