Invasive Species Compendium

Detailed coverage of invasive species threatening livelihoods and the environment worldwide

Abstract

Infestation induced biochemical reactions on papaya by mealybug, Paracoccus marginatus Williams and Granara de Willink (Hemiptera: Pseudococcidae).

Abstract

Paracoccus marginatus Williams and Granara de Willink, (Hemiptera: Pseudococcidae) is an invasive alien sucking pest that attacks several genera of economically important tropical and subtropical plants. Biochemical study revealed that total protein content was very low (1.88 mg/g) in plants inoculated with third instar nymphs of papaya mealybug, whereas the plants inoculated with adult mealybugs recorded a higher protein concentration of 4.60 mg/g. Similarly, plants inoculated with third instar nymph of papaya mealybug had a decreased mean concentration (0.019 mg/g) of Indole Acetic Acid (IAA) whereas plant inoculated with adult mealybugs recorded the highest mean IAA concentration was 0.070 mg/g. The papaya seedlings uninfested with papaya mealybug recorded the highest protein (5.34 mg/g) and IAA (0.185 mg/g) content. However, the gibberellic acid content of 5 µg/g was estimated from the leaves of plants showing crinkling symptom infested with third instar nymphs and the uninfested papaya seedlings recorded lower levels of gibberellic acid content of 1 µg/g.