Main pests and diseases of persimmon: Identification, damage and control
The cultivation of persimmon (Khaki Diospyros) has experienced a notable increase in surface area and commercial importance, especially in countries with a Mediterranean climate. However, this intensive development has brought with it an increase in the incidence of pests and diseases, some known in other crops and others emerging, it is essential to understand how to recognize and manage them efficiently.
Most frequent and damaging pests in persimmon cultivation
- White fly (Aleurothrixus floccosus y Dialeurodes citri): Hemiptera-type insects that affect persimmons, citrus fruits, and carob trees.
- Cotton wool (Planococcus citri): Persistent pest that produces cottony masses, is found in fruits and stems, difficult to eradicate due to its mobility and reproduction.
- Mediterranean fly (Ceratitis capitata): Considered the most destructive pest, damaging the fruits by laying eggs and the development of larvae that render them unfit for consumption.
- Caparetta (saissetia oleae): Mealybug, whose attack may be accompanied by sooty mold, affects the quality and health of leaves and fruits.
- Criptoblabes gnidella: A borer whose presence is associated with fruits with a persistent corolla, laying protected eggs and damaging the skin of the fruit.
- Other occasional pests: Bed bugs, aphids, ceroplastes sinensis, Aspidiotus nerii, Streblote panda.
Main diseases of persimmon: Description and symptoms
- Persimmon leaf spot (Plurivorosphaerella nawae = Mycosphaerella nawae): Considered the most harmful disease for crops. It is transmitted by spores formed on leaf debris and develops under humid conditions and temperate temperatures. Its symptoms, which include necrotic leaf spots, chlorosis, and premature defoliation, can lead to early fruit drop and serious economic losses.
- Root rot (Armillaria mellea): Soil fungus that affects the root, causing progressive decline, wilting and eventually death of the plant.
- Sooty mold: It develops on the honeydew excreted by some pests such as scale insects and whiteflies, covering leaves and fruits with a black layer that reduces the photosynthetic capacity and commercial value of the fruit.
- Other diseases of lower incidence: Persimmon can be attacked by other phytopathogenic fungi (such as Alternaria fungus and mildew), especially in scenarios of stress or agronomic neglect.
Whitefly on persimmon: Biological cycle and integrated control
La whitefly is easily identifiable Due to their waxy color and small size (1,5 mm), their colonies cover the leaves with a cottony, oily mass, promoting the appearance of sooty mold. They remain active year-round in warm areas, where several generations may overlap per growing season.
El biologic control by releasing parasitoids such as Cales noacki It is highly recommended to keep the pest at bay. When the infestation level is high and there are not enough natural enemies, phytosanitary treatments are recommended, selecting authorized products and applying them preferably during the larval stage before detecting the sooty mold. To learn more about the different strategies, it is also interesting to consult how to preserve different varieties of persimmon.
Mealybug and mealybug: Identification and control methods
El Q-tip (Planococcus citri) is located in protected areas of the fruits, presenting cottony white massesIts mobility and ability to hide in different parts of the plant make it difficult to control.
During the winter, all forms of mealybugs can be found sheltering on the plant or in the soil. Activity increases from spring to Its peak activity is in the second half of summer..
The most effective control is biological, using auxiliary fauna such as Cryptolaemus montrouzieri, whose release must be coordinated at the most appropriate times. The indiscriminate use of insecticides during the action of these allies is counterproductive. In cases of uncontrollable infestations, resorting to specific phytosanitary products, respecting the safety deadlines, is the last option. To strengthen the crop's resistance, it may be useful to learn how to caring for the persimmon bonsai.
Persimmon leaf spot: Epidemiology, symptoms and fungal cycle
The fungus responsible for leaf spot (Plurivorosphaerella nawae) produces spores sexual (ascospores) that develop in fallen leaf litter. Spore release coincides with mild temperatures and high humidity (heavy rain or dew). Spring infections cause brown lesions on leaves, which progress to premature abscission. For more effective control, it's also helpful to understand the behavior of the .
In sensitive varieties such as 'Tonewater' and 'Sharon', the leaves may take on a reddish hue. early fall of leaves and fruits It significantly reduces the annual production and commercial quality of the fruit, leaving trees completely defoliated at the end of the vegetative cycle.
- Infections occur mainly in spring, with symptoms appearing in late summer.
- The spread of the fungus can increase if leaf litter is not properly managed. Flood irrigation also facilitates the release of ascospores compared to localized irrigation.
Integrated management: Cultural, chemical and biological strategies
La Integrated pest and disease management in persimmon It should not be based solely on phytosanitary treatments. It is essential to combine different techniques to achieve sustainable production:
- Cultural measures: Collect or incorporate leaf litter into the soil after leaf fall to reduce the source of fungal inoculum. Composting or controlled incineration are valid practices.
- Chemical control: Preventive fungicide application should only be carried out during periods of risk, choosing products from different families to avoid resistance. It is recommended alternate active ingredients and never exceed the maximum number of applications stipulated.
- Biologic control: Promote the presence of natural allies (such as parasitoids and predators) and carry out scheduled releases for problematic pests such as whiteflies and mealybugs.
- Surveillance: Conduct frequent inspections and follow the official bulletins of each autonomous region to schedule the most appropriate interventions.
- Good Agricultural Practices (GAP): Use only authorized products, respect dosages and safety guidelines, and avoid applications outside of critical periods.
Weed destruction and common accidents
Eliminating weed competition It can be carried out using mechanical work or mowing, avoiding the use of unauthorized herbicides. Always consult with specialized technicians before any chemical application.
As for the physiological or climatic accidents Of note among persimmons is the wood's sensitivity to wind, the appearance of physiological disorders such as fruit ironing and spotting due to heat stress or errors in the application of pesticides, and the high level of damage from hail. It is vital to use support systems and protect wounds on branches to minimize the entry of borers and termites.
Control of product residues and prevention of resistance
La Presence of phytosanitary product residues in persimmon It is one of the aspects most closely monitored by markets and health authorities. It is crucial to perform pre-harvest analyses and never perform treatments after the risk period. Repeated use of the same active ingredient can promote pathogen resistance and the loss of treatment effectiveness, so alternating and rotating fungicides and active ingredients is a mandatory practice.
Sources of information and specialized advice
It is essential to regularly consult the official phytosanitary bulletins of each autonomous community to know the health status of the crops and the most up-to-date intervention recommendations, as well as the Official Registry of Phytosanitary Products before applying any treatment. For particularly difficult cases, technical support can be requested via email from official agricultural agencies.
Bibliographic databases and specialized webography
The content of this article is based on technical experience, university studies, and official phytosanitary control bulletins and manuals. Consult the Ministry of Agriculture's integrated guides, the most up-to-date recommendations from regional entities, and reference literature to enrich the comprehensive approach to pest and disease management in persimmon.
Effective management of persimmon pests and diseases protects crop productivity, minimizing economic losses and ensuring agronomic and environmental sustainability. With a combination of surveillance, preventive strategies, biological control, and responsible phytosanitary applications, producers can guarantee the health and quality of their crops in a sustainable and competitive manner.