Mixtures between Beauveria bassiana and potassium silicate to manage thrips in tomato plants for industrial processing

Abstract

Thysanoptera species can transmit virus to Solanaceae family vegetables, including tomato plants for industrial processing, causing the disease known as Tomato Spotted Wilt Virus (TSWV). Thrips resistance to insecticides indicate the urgent need of techniques adequate for Integrate Pest Management practices. The objective was to evaluate the control efficiency (CE%) against Frankliniella schultzei (Thysanoptera: Thripidae) of the fungus Beauveria bassiana (Bb), the resistance inducer potassium silicate (KSil) and the chemical insecticide profenophos + cypermethrin (PC) isolated, or in binary mixtures. The treatments were foliar spraying on tomato plants with Bb (T1), KSil (T2) and PC (T3) isolated or in mixtures of Bb+KSil (T4), PC+KSil (T5) and Bb+PC (T6). Thrips were sampled with white plastic trays at 0, 1, 7, 14 and 21 days after application (daa). The CE% of each product (isolated or in mixtures) differed at all time intervals. The Bb+KSil treatment had highest CE% from 24 hours of application, until the end of the experiment, ranging from 95% (1 daa) to 41.5% (21 daa). The CE% decreased in all treatments with a quadratic curve behavior, throughout time. PC insecticide, isolated, showed a decreased CE% through a linear regression. Grouping analyzes indicated the Bb+KSil effect was more dissimilar than the other evaluated treatments. Synergism between Bb and KSil, in mixture, indicate its potential for Integrated Pest Management programs of F. schultzei in tomato plants for industrial processing.

Investigating the Efficacy of Potassium Silicate and Potassium Sulfate against the Pistachio Psyllid (Agonoscena pistaciae) under Field Conditions

“…Furthermore, even after 21 days, potassium silicate showed the highest control, which reveals its long-lasting effectiveness against A. pistaciae nymphs. Potassium silicate, alone or in combination with different pesticides, has been shown to have acceptable efficacy against various pests [15,16]. Powders containing silicon (Si) are known to destroy the lipid surface layer of insects such as Tribolium castaneum (Coleoptera: Tenebrionidae) [17].…”

The Registration Situation and Use of Mycopesticides in the World

“…Mycopesticides have a prolonged period of infection, and when combined with other pesticides, they can enhance insecticidal efficiency. The mixture of B. bassiana and the resistance inducer potassium silicate had a higher control effect on Frankliniella schultzei [ 131 ]. Additionally, the combination of Akanthomyces attenuatus and Botanical Insecticide matrine demonstrated a significant synergistic effect on Megalurothrips usitatus [ 132 ].…”