Note: The main affected areas in Spain are greenhouses in Almería, where sweet peppers are the primary crop, alongside eggplants, cucumbers and ornamental flowers. Outbreaks have surged since 2020. This pest is harder to control than Frankliniella occidentalis. Conventional thrips pesticides often fail easily. It has overlapping life stages, pupates in soil and rapidly develops pesticide resistance.
easily. It has overlapping life stages, pupates in soil and rapidly develops pesticide resistance.
EU plant protection regulations: Repeated continuous use of a single active ingredient is prohibited. IPM (Integrated Pest Management) is prioritized. Pesticides are divided into biocontrol‑compatible products and fast‑acting products incompatible with natural enemies, matching Spain's mainstream greenhouse biocontrol system with Orius laevigatus.
Case 1 | Sweet Pepper Greenhouse in Almería (Heavy outbreak, poor control from previous pesticides)
Background: A 1.2 hm² sweet pepper greenhouse suffered a heavy outbreak of Thrips parvispinus in October. Heavy rust spots and flower drop appeared on flowers and young fruits. The farmer applied spinosad and abamectin alone for three consecutive times, achieving only around 20% control efficacy. Orius laevigatus had already been released in the greenhouse, so risky pesticides could not be applied casually.
Control challenges: All stages (adults, nymphs, eggs and soil pupae) coexist with fully overlapping generations. The local hot and dry climate in Spain speeds up reproduction: one generation takes only 6–8 days at 27°C.
Two‑stage rotation program
Emergency knockdown (before releasing natural enemies, pre‑planting / early seedling stage, natural enemies isolated) Spinetoram SC Application: Spray at dusk. Thoroughly cover young shoots, flowers, leaf undersides, and drench the soil surface at the same time. 7‑day interval; maximum 2 consecutive applications per season. Efficacy: >85% mortality of adults and young nymphs within 72 hours after spraying, rapidly reducing pest population. Caution: Highly toxic to Orius laevigatus. Wait 10–15 days after application before releasing Orius.
Long‑term maintenance (after releasing Orius, coexistence with natural enemies - core recommended program) Tank mix: Cyantraniliprole SC + Spirotetramat SC Advantages: Safe for Orius laevigatus, compatible with biocontrol. Cyantraniliprole delivers contact and systemic activity against multiple pest stages. Spirotetramat has bidirectional systemic movement, inhibits egg hatching and kills young nymphs to break the reproduction cycle. Frequency: Every 10–14 days, rotate with pesticides from different IRAC groups.
Result: After two rounds of treatment, pest population dropped below the economic threshold. New fruits had no thrips scars, the Orius population remained stable, and no rebound occurred in the following 45 days. This is the standard chemical program for T. parvispinus promoted by BASF and local agricultural technical stations in Spain.
Case 2 | Ornamental Greenhouse in Valencia (Preventive control at low pest pressure, low MRL requirement for export flowers)
Background: Ornamental plant greenhouse with sporadic thrips infestation. The goal is to protect flowers and foliage with low pesticide residues for export standards. The grower relies long‑term on Amblyseius montdorensis predatory mites, so fast‑acting high‑risk pesticides cannot be used.
Program: Sulfoxaflor + Beauveria bassiana + silicone adjuvant Mechanism: Sulfoxaflor shows strong activity against adult and nymph thrips. Beauveria bassiana provides persistent infection for long‑term suppression at low pest density. The adjuvant improves spreading and penetration inside flowers and curled leaves. Features: Mild formulation, suitable for prevention and moderate pest pressure; not for emergency outbreak control. Field performance: 70–78% control efficacy 7 days after a single application. It can be alternated with physical agents such as mineral oil and maltodextrin to reduce chemical selection pressure.
Case 3 | Extremely resistant fields (pepper, resistance to spinetoram confirmed)
Background: The field has received continuous applications of spinosad / spinetoram for years. Monitoring confirms obvious resistance, with very slow pest decline after spraying.
Rotation emergency option: Chlorfenapyr SC Features: Unique mode of action, no cross‑resistance with spinosyns or cyantraniliprole. Effective against eggs, nymphs and adults. Restrictions: High risk to natural enemies; cannot be used together with Orius laevigatus. Only for emergency sanitation or seedling stages when natural enemies are isolated. Strictly limit application times per season to avoid new resistance. Synergy tips: Mix with mineral oil / orange oil ME to seal flower crevices and boost contact efficacy. Also drench the soil surface to target soil pupae. Efficacy: Over 80% control 3 days after treatment in resistant fields. It is positioned as an emergency rotation product and not for regular continuous use.
✅ Proven effective pesticide list for Spain (classified by scenario for export promotion) Emergency fast knockdown (heavy outbreak, seedling stage, before releasing natural enemies): Spinetoram, Spinosad, Abamectin, Chlorfenapyr
Biocontrol‑compatible (flowering stage, Orius / predatory mites released - priority): Cyantraniliprole, Spirotetramat
Biological / low‑residue options (organic farming, export flowers, low threshold management): Beauveria bassiana, Azadirachtin, Mineral oil, Maltodextrin
Important reminder: Spanish agricultural technical documents clearly warn against long‑term solo use of spinetoram. Resistance to spinetoram has been widely detected across Spain, which is the main reason for poor control.
✅ Standard field operation guidelines for Spain
Application time: Dusk. Thrips parvispinus avoids light and feeds actively at dusk.
Spray targets: Flowers, young growing points, leaf undersides, plus soil surface. This thrips pupates in soil; spraying only foliage easily leads to rebound.
Rotation rule: Rotate strictly by IRAC codes. Do not apply pesticides from the same IRAC group more than twice in a row.
Adjuvants: Add silicone adjuvant. Thrips hide deep inside flower crevices where liquid hardly penetrates.
Monitoring: Count pests continuously with blue sticky traps. Start control immediately when >3 thrips per plant are found.
Physical support: Insect screens, post‑harvest sanitation, empty greenhouse fumigation to break cross‑cycle pest sources.
❌ Warning case (lesson for customers) One farmer applied spinetoram alone for four consecutive times. It worked initially, but failed completely after the third spray. Pest populations rebounded sharply. Meanwhile, the pesticide killed large numbers of Orius, collapsing the whole biocontrol system in the greenhouse. The farmer finally had to clear the whole crop.
Core conclusion: There is no universal silver‑bullet pesticide. Successful control of Thrips parvispinus in Spain = continuous monitoring + staged pesticide rotation + natural enemy management + soil pupae treatment.
