Publications by authors named "Alexandra M Revynthi"

, or "mamey sapote", is a tropical fruit tree native to Central America and Southern Mexico, producing sweet, nutrient and vitamin-rich fruit. Several insect pests are known to infest but none have been associated with plant growth alterations. Eriophyoid mites are well known to cause plant malformations, but mites that cause this type of damage to mamey sapote have not been reported.

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  • Since 2015, Hood has become a major pest for strawberries in Florida, creating a need for better management strategies.
  • The study investigated using banker plants, specifically ornamental pepper and sweet alyssum, to attract natural predators of thrips to help control their populations.
  • Findings from the study indicated that strawberries near ornamental pepper plants experienced less leaf damage, suggesting that these plants may effectively repel pests and promote natural pest control.
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  • * A study evaluated the effects of various insecticides on the survival, feeding, and reproduction of three predatory mites, revealing that spinetoram had the most severe impact while C. javanica had the least.
  • * Overall, all insecticides reduced predator survival and feeding, with low predation on S. dorsalis, suggesting that using entomopathogenic fungi alongside predatory mites may be a viable approach for managing these pests in strawberries.
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Florida's strawberry industry is currently valued at $511 million annually but faces challenges from pathogens and arthropod pests especially Tetranychus urticae Koch (twospotted spider mite) and Scirtothrips dorsalis Hood (chilli thrips). Predatory mites, particularly Neoseiulus cucumeris Oudemans, Neoseiulus californicus McGregor, and Amblyseius swirskii Athias-Henriot, play a crucial role in pest management. However, there are concerns regarding how these biological control agents are affected by fungicides used in current pathogen management strategies.

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  • The hibiscus bud weevil (HBW) poses a serious threat to tropical hibiscus in Florida since its invasion in 2017, making early detection vital.
  • This study investigates the effectiveness of using pheromone lures, previously successful for other pests, in attracting HBW, testing various trap types, colors, and lure sizes.
  • Results show yellow sticky traps with cranberry weevil lures are particularly effective for capturing HBW, but further research is needed to confirm the lure's overall efficiency.
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In 2020, the invasive (Karny) was first detected in Florida, United States. In response to the implemented regulatory restrictions, we conducted laboratory experiments under containment conditions. Thrips larvae and adults were exposed to 32 products (conventional and biorational insecticides) either directly or indirectly.

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The lychee erinose mite, Aceria litchii (Keifer), is a tiny eriophyid mite known to induce the formation of open galls (erinea) on lychee plants, Litchi chinensis Sonn. In lychee infested by A. litchii, four stages of erineum are observed, based on erineum color: hyaline, white, amber and dark brown.

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  • * Traditional biological control methods are becoming less effective, prompting the exploration of new management strategies such as transgenic plants that utilize insecticidal proteins from Bacillus thuringiensis (Bt).
  • * A study successfully developed a bioassay method using fresh corn tissue to test the effectiveness of the Cry1Ac protein against various Diatraea species, revealing over 90% mortality and growth inhibition in test subjects.
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Herbivore-Induced Plant Volatiles (HIPVs) are volatile signals emitted by plants to deter herbivores and attract their natural enemies. To date, it is unknown how lychee plants, , respond to the induction of leaf galls (erinea) caused by the lychee erinose mite (LEM), . Aiming to reveal the role of HIPVs in this plant-mite interaction, we investigated changes in the volatile profile of lychee plants infested by LEM and their role on LEM preferences.

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In 2017, the hibiscus bud weevil (HBW), Linell (Coleoptera: Curculionidae), was found outside of its native range of Mexico and Texas, infesting hibiscus plants in Florida. Therefore, we selected 21 different insecticide and horticultural oil products to evaluate their effects on the reproductive rate, feeding, and oviposition behavior of the HBW. In laboratory experiments, significant mortality was observed in adult weevils exposed to diflubenzuron-treated hibiscus leaves and buds, and hibiscus buds treated with diflubenzuron contained the fewest number of eggs and feeding/oviposition holes.

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Dispersal is the main determinant of the dynamics and persistence of predator-prey metapopulations. When defining dispersal as a predator exploitation strategy, theory predicts the existence of a continuum of strategies: from some dispersal throughout the predator-prey interaction (the Milker strategy) to dispersal only after the prey had been exterminated (the Killer strategy). These dispersal strategies relate to differences in prey exploitation at the population level, with more dispersal leading to longer predator-prey interaction times and higher cumulative numbers of dispersing predators.

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Originating in northeastern Mexico and southern Texas, the hibiscus bud weevil (HBW), Linell 1897, was discovered infesting China rose hibiscus ( L.) in south Florida in May 2017. Although the biologies of the congeneric boll weevil, Boheman 1843, and pepper weevil, Cano 1894 are well documented, no data are available regarding the biology of HBW.

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Cannibalism is a widespread phenomenon in nature, often occurring when food is scarce, for example among predators that have overexploited a local prey population. Instead of cannibalising, predators can disperse, thereby avoiding being cannibalised or cannibalising related conspecifics, which results in inclusive fitness loss. Theory on prey exploitation in ephemeral predator-prey systems predicts that predators may be selected to display prudent predation by dispersing early, thus saving food for their remaining offspring.

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The lychee erinose mite (LEM), (Keifer) is a serious pest of lychee ( Sonn.). LEM causes a type of gall called 'erineum' (abnormal felty growth of trichomes from the epidermis), where it feeds, reproduces and protects itself from biotic and abiotic adversities.

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Citrus leprosis is a destructive disease of citrus caused by several viruses (CiLVs) that are quarantine pests in the United States. Brevipalpus yothersi Baker (Acari: Tenuipalpidae) vectors the most virulent strain of CiLV. This mite is present in the United States and could facilitate the spread of the disease if CiLV reaches the country.

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When predators commonly overexploit local prey populations, dispersal drives the dynamics in local patches, which together form a metapopulation. Two extremes in a continuum of dispersal strategies are distinguished: the "Killer" strategy, where predators only start dispersing when all prey are eliminated, and the "Milker" strategy, in which predator dispersal occurs irrespective of prey availability. Theory shows that the Milker strategy is not evolutionarily stable if local populations are well connected by dispersal.

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