Pistachio psyllid pest, the silent enemy of Iranian pistachio orchards

The pistachio tree is one of the most important export and strategic products of Iran, which brings significant annual income to the country. However, the economic production of pistachios in the country, especially in hot and dry regions, is always threatened by various pests and diseases. One of the most serious pests of the pistachio tree is the pistachio psyllid or dry sap, which is known by the scientific name Agonoscena pistaciae.

The pistachio psyllid is considered a primary pest of pistachios, which causes great damage to gardeners annually. Controlling this pest requires accurate knowledge, proper timing, and adherence to integrated management principles.

Characteristics and biology of the pistachio psyllid pest

1. Scientific name: Agonoscena pistaciae
2. Order: Hemiptera
3. Family: Psyllidae This pest is native to Iran and its only host is the pistachio tree. Pistachio psyllids appear as small, greenish-yellow insects with red eyes. Its eggs are pale yellow and elongated, and are laid singly or in groups on the back of the leaves.

Life cycle:

• The pistachio psyllid spends the winter as a full-grown insect in the cracks of the trunk and under the bark.
• In early spring, as the buds open, it begins its activity and begins to lay eggs.
• In hot and dry climates, this pest can have 8 to10generations during the growing season.
• Each generation lasts about 15 to 25 days, with the life cycle speeding up as the weather warms.

Damage caused by pistachio psyllid

1. Feeding from plant sap: Biting leaves and feeding on plant sap weakens the tree and reduces the growth of leaves and branches.
2. Leaf loss: In the event of an outbreak of the pest, leaf loss is very common in the middle of the season.
3. Reduced photosynthesis: The presence of dry sap on the leaves prevents light and gas exchange and reduces tree yield.
4. Reduced product quantity and quality: Pistachios Light, hollow or with incomplete kernels are a direct result of pest activity at sensitive stages of growth.
5. Increased pesticide use: Psyllium outbreaks cause excessive and excessive use of pesticides, resulting in environmental pollution.

Factors affecting pest outbreaks

• Reduction of natural enemies due to excessive use of pesticides.
• Improper irrigation and drought stress.
• Poor tree nutrition and nutrient deficiencies.
• High density of trees and poor ventilation in the orchard.
• Early spring heat and dry summers.

Natural enemies of pistachio psyllid

1. Parasitoid wasp (Psyllaephagus pistaciae) – predator of pupae and nymphs.
2. Lace-wings _ (Chrysopidae)
3. Ladybugs(Coccinellidae) – especially the seven-spotted ladybugs.
4. Predatory ants(Anthocoridae)
5. Spiders and syrphid flies
6. Pathogenic fungi

Methods for controlling pistachio psyllid pest

1) Agronomic control

• Regular irrigation and prevention of drought stress
• Proper pruning for better ventilation
• Proper nutrition of trees with potash fertilizers and Micronutrients
• Weed Management and Garden Hygiene

2) Biological Control

• Using Natural Enemies Such as Bees and Ladybugs
• Avoiding the Excessive Use of Pesticides That Kill Natural Enemies It kills
• Using biological formulations such as fungal insecticides (Beauveria bassiana)

3) Chemical control

Spraying time:

• Early June, when the second generation emerges
• Late July to early August if needed
• Pest monitoring is essential before taking any action.

Effective pesticides:

Pest name	Dose Usage	Tips
Imidacloprid (Confidor)	0.5 parts per thousand	Systemic, use with caution
Emulsifiable oil (summer oil)	10 parts per thousand	In combination with insecticides to increase effectiveness
Spirotetramat (Movento)	0.5 parts per thousand	Systemic, with a two-way transfer effect

Note: Always check pest density with a yellow card or visual inspection before spraying.

Integrated Pest Management (IPM) for Pistachio Psyllium

Integrated pest management is used to reduce pest populations below economic loss thresholds and maintain environmental sustainability.

Key Steps:

1. Continuous pest monitoring from late April to September
2. Targeted use of pesticides
3. Protection from natural enemies
4. Reducing tree stress with proper nutrition and irrigation
5. Training workers and gardeners

Conclusion

Although the pistachio psyllid is a small insect and It is delicate, but its damage can be catastrophic. The only way to control this pest systematically and sustainably is to adopt a scientific approach, use integrated methods, reduce pesticide use, and increase gardener awareness.