Seed Health Management for Better Productivity - Govind Ballabh ...

(Seed Health Management for Better Productivity)Callosobruchus chinensis (Linnaeus) – Pulse BeetleAdults have a pair of distinct ridges (inner and outer) on the ventral side of each hindfemur, and each ridge has a tooth near the apical end. The inner tooth is slender, rather parallelsided, and equal to (or slightly longer than) the outer tooth. Antennae pectinate in male and serratein female. Elytra pale brown with small median dark marks and larger posterior patches which maymerge to make entire posterior part of elytra dark in color. The side margins of abdomen havedistinct patches of coarse white setae.Callosobruchus maculatus (Fabricius) – Pulse BeetleAdults have a pair of distinct ridges (inner and outer) on the ventral side of each hindfemur, and each ridge has a tooth near the apical end. The inner tooth is triangular, and equal to(or slightly longer than) the outer tooth. The antennae of both sexes are slightly serrate. Femaleoften have strong markings at elytra consisting of two large lateral dark patches mid-way along theelytra and smaller patches at anterior and posterior end , leaving a paler brown crossed shapedarea covering the rest. Males are much less distinctly marked.Callosobruchus analis (Fabricius)Antennae filiform. Coloration and patterning of both sexes is similar to that of an averagefemale C. maculatus, except that the pronotum of C. analis is uniformly red-brown (usually blackor dark brown in C. maculatus). In freshly emerged specimens, white setae at the center ofposterior half of each elytron are very conspicuous in C. analis but inconspicuous in C. maculatus.As in all Callosobruchus species, each hind femur has a pair of ridges on the ventral edge; in C.analis the outer ridge bears the usual noticeable blunt tooth, but the inner tooth is usually muchsmaller or even absent.FAMILY CURCULIONIDAEAll adults are characterized by a rostrum, which is forward snout-like extension of the headand carries the mouth part. The antennae are elbowed in shape while at rest. The larvae are leglessSitophilus oryzae (Linnaeus) - Rice WeevilSitophilus zeamais Motschulsky - Maize WeevilBoth the species are almost indistinguishable from each other externally. Both havecharacteristic rostrum and elbowed antennae which have eight segments and often carried in anextended position when the insect is walking. Both species usually have four pale reddish-brownor orange brown oval marking on the elytra, but these are often indistinct.Sitophilus granarius (Linnaeus) – Granary WeevilSitophilus granarius is similar in appearance to S. oryzae and S. zeamais, but can bedistinguished by the absence of metathoracic flight wings (only small vestigial wings are present)and by the oval shape of punctures on the prothorax.- 166 -