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

  • T. Jimcymariya College of Horticulture, Kerala Agricultural University, Thrissur 680 656, Kerala
  • Mani Chellappan College of Horticulture, Kerala Agricultural University, Thrissur 680 656, Kerala
  • M.T. Ranjith College of Horticulture, Kerala Agricultural University, Thrissur 680 656, Kerala
Keywords: Papaya mealybug, Paracoccus marginatus, total protein, Indole- 3-Acetic Acid, Gibberellic Acid

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 (1.88mg/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 5μg/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.

How to Cite
Jimcymariya, T., Chellappan, M., & Ranjith, M. (1). Infestation induced biochemical reactions on papaya by mealybug, Paracoccus marginatus Williams and Granara de Willink (Hemiptera: Pseudococcidae). ENTOMON, 39(3), 119-128. Retrieved from https://www.entomon.in/index.php/Entomon/article/view/51
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