Aspects of the ecology of the invasive corn planthopper, Stenocranus pacificus Kirkaldy (Hemiptera:Delphacidae): host plant interactions, seasonal occurrence, and confounding damage by sooty molds
2018
Caasi-Lit, M.T. | Lit, I.L.
Data on the corn planthopper (CPH),Stenocranus pacificus Kirkaldy are updated to further clarify issues regarding its spread from Mindanao to Luzon, based on simple field experiments, casual field observations, and collections, and review of data from our other studies. The continued occurrence of CPH is confirmed and is not anymore limited to the dry cropping season. Apart from CPH, there are other suckling on corn, namely: Peregrinusmaidis (Ashmead), Proutista moesta (Westwood) (Derbidae), Cicadulina bipunctata (Melichar), Cofana spectra Distant, Ricania sp., Rhopalosiphum maidis (Fitch) and Dysicoccus brevipes (Cockerell). These are all phloem-feeders and their collective presence and abundances can cause severe stress to corn plants. Aside from direct damage, great numbers of CPH also effect plant growth and development by the sooty molds that grow on the accumulated honeydew. Sticky black molds also attract different organisms the decrease photosynthesis, and increase leaf surface temperature, that both eventually stunt corn plants. All corn varieties are attacked, whether open-pollinated varieties, classical or genetically engineered hybrids, confirming our earlier conclusions. The observed movement of CPH from non-Bt to Br corn at postharvest in Isabela [Philippines] was were already broken due to borer stalk damage. Aside from corn, CPH also attacks sorghums (common and sweet, Sorghum bicolor (L.) Moench.)and wild (S. halepense (L.) Pers.), itch grass (Rottboellia cochinchinensis (Lour.) Clayton), Job's tears (Coixlacryma-jobi L.) and maramais (Tripsacumlaxum Nash).
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