Population dynamics of plant- and leafhoppers and their natural enemies in rice ecosystems in the Philippines uri icon

abstract

  • The population dynamics of plant- and leafhoppers and associated predators and parasitoids at five rice sites in the Philippines, are compared. Twelve species of Auchenorrhyncha, nine Cicadellidae and three Delphacidae, were found in the samples. The order of abundance was Nephotettix virescens>Sogatella furcifera>Nephotettix nigropictus>Nilaparvata lugens. The dominant predators were mostly Heteroptera [Microvelia douglasi atrolineata (Veliidae) and Cyrtorhinus lividipennis (Miridae)] followed by spiders [Pardosa pseudoannulata (Lycosidae) and Callitrichia formosana (Linyphiidae)]. The delphacid and cicadellid populations were characterized by high initial densities, which reached a peak and were followed by a decline with low growth rates. Populations of heteropteran predators were similar, except that the peaks were at a later stage and growth rates were higher. Predator diversity and evenness were significantly lower in Los Banos and Cabanatuan. The results are discussed in relation to implications to plant- and leafhopper management.

publication date

  • 1992
  • 1992