Morphometric Life Attributions of Red Palm Weevil, Rhynchophorus ferrugineus (Olivier) under two Controlled Consecutive Temperatures
Morphometric Life Attributions of Red Palm Weevil, Rhynchophorus ferrugineus (Olivier) under two Controlled Consecutive Temperatures
Wali Muhammad Mangrio1*, Yasmeen Buriro1, Hakim Ali Sahito1, Faheem Ahmed Jatoi1 and Fahmeeda Imdad Sahito2
ABSTRACT
The present research was carried out at (20±2°C) and (30±2°C) temperatures under laboratory conditions during, 2023 to determine the morphological attributions of Rhynchophorus ferrugineus. The female eggs color patterns were milky white oval, and cylindrical. The length and width of eggs (2.56±0.40) (1.18±0.28) were noted at (30±2°C) followed by (2.33±0.42), (1.102±0.22) mm, at (20±2°C). The newly hatched larvae were white-brown and gradually turned into dirty-brown at later stages. The 1st instar stage measurement was recorded (0.98±0.31), 2nd (172±0.40), 3rd (2.86±0.52), 4th (0.63±0.25), and 5th (3.54±0.70) mm at (30±2°C). Similarly, at (20±2°C), the 1st instar stage measured (0.45±0.21), 2nd (0.67±0.28), 3rd (1.20±0.37), 4th (2.10±0.45), and 5th (2.96±0.64) mm in size. The larvae weight of each stage was recorded (0.18±0.24), (0.99±0.23), (1.42±0.25), (2.96±0.43) and (4.44±0.74) in grams at (30±2oC). However, at (20±2oC), larvae weight was calculated (0.15±0.09), (0.78±0.18), (1.12±0.27), (2.165±0.35) and (3.98±0.66). The radish-brown pupae body length was recorded (3.65±0.45), its weights reported (4.94±0.72), and (4.66±0.80) in grams. The radish-brown black colored patches of male length were (2.98±0.51), female (3.22±0.60) at (30±2°C) as followed (3.14±0.31), (2.87±0.29), (3.10±0.58) mm at (20±2°C). Five days old adult males and females weights were (2.16±0.31), (2.52±0.40) and (1.87±0.29), (2.10±0.48) at both temperatures, in three replications. This species of insect pest is sporadic in its feeding habits and habitat, causing great losses to the economic heritage of many nations. It is further suggested that more work should be carried out on different survival patterns of this invasive pest species of date palm orchards.
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