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Manual for the identification of citrus pests and diseases in the field

Abridged guide to identifying citrus pests and quarantine diseases

The Pomacea insularum (apple snail) species is found in Spain. First detected in 2009, it has spread throughout the Ebro Delta. This species is considered one of the 100 most harmful invasive species.

Biological control of whiteflies Aleurothrixus floccosus, Dialeurodes citri and Parabemisia myricae (Homoptera: Aleyrodidae) in Valencian citrus fruits by means of Hymenoptera parasites Amitus spiniferus

United States-Spain collaboration program for the export of clementines to the United States, 2021-2022 campaign

The orchid thrips, Chaetanaphothirps orchidii, has been present in Spain for years and normally feeds and develops on various species of spontaneous and ornamental plants without causing damage to crops. However, damage caused by this insect has been observed on citrus fruits for the past two years.

Fire blight is a disease caused by the bacterium Erwinia amylovora that affects various species of the Rosaceae family, including pear, apple, quince, Japanese medlar, etc.

The almond wasp (Eurytoma amigdali E) is a hymenopteran recently discovered in almond orchards in the Valencian Community. The adults are black and emerge in spring from the fruit they parasitized the previous season.

Given the damage caused by thrips observed since May on leaves and fruit in various citrus, persimmon and pomegranate crops and the confirmation of the presence of Scirtothrips aurantii Faure in certain areas, the following recommendations have been considered appropriate:

During the 2019 campaign, control failures were detected in some plots in the Ribera Alta region (Alzira, Benimuslem, Guadassuar, and Massalavés). Systematic surveys carried out in 2020 revealed that the resistance of the fungus Plurivorosphaerella nawae to the QoI group of fungicides (strobilurins) was present in most persimmon-producing areas in the province of Valencia.

Delottococcus aberiae has become a key pest in the fields where it is present because it causes severe damage and is difficult to control. In addition to the damage typical of other pseudococcid species, this species causes deformation and/or reduction in fruit size. Delottococcus aberiae deforms fruit from petal fall until the fruit reaches a diameter of 2–3 cm.

Fruit fly (Ceratitis capitata). Recommendations for farmers to achieve maximum effectiveness in fruit fly treatment.

In the various areas where Drosophila suzukii is being monitored, populations of this insect are being detected. Remember that attacks tend to be more intense and frequent at the beginning of the harvest, and treatment will be especially necessary in plots that were attacked in previous years and that left cherries unharvested last year (fly damage or cracking, lack of profitability, etc.).

The second generation of the plum moth has been seen flying between late May and early June in the Ribera and Val d'Albaida regions, and somewhat later in inland areas. Eggs will hatch this week and next. Treat accordingly.

The olive fruit fly population is beginning to increase this year, so an initial bait treatment is recommended. Once the first pitted olives appear, the next generation of adults will emerge approximately 25 days later, and a second bait treatment is required to control them.

Field Pest Situation Report, 2024 Campaign, Week 43: October 21-October 27

Field Manual for the Prevention of HBL (Huanglongbing), a bacterial disease that affects the plant's vascular-phloem system and causes the death of citrus fruits: oranges, mandarins, lemons, grapefruits, limes, and other citrus fruits. Spread by insect vectors: Trioza erytreae and Diaphorina citri. Target organs: leaves, stems, roots, and fruits.

Poster with general information for preventing the bacterial disease HBL (Huanglongbing, greening, etc.), which affects the plant's phloem. The causative agent is the bacterium Candidatus Liberibacter spp.

Information poster with general information on preventing the bacterial disease HBL (Huanglongbing, greening, etc.), which affects the plant's phloem. The causative agent is the bacterium Candidatus Liberibacter spp.

The African psylla (Trioza erytreae) is a sucking insect of the order Hemiptera, belonging to the family Triozidae.