Contents - Faperta

Evaluation of Transgenic Plants and Mapping Populations for Resistance to Insect Pests 67
TABLE 3.7 (continued)
Crop Insect Species Remarks References
African head bug, Eurystylus Longer covering of the grain by the Sharma et al. (1994)
oldi
glumes and grain hardness impart
resistance.
Cotton Bollworms, Helicoverpa, Leaf pubescence associated with Sharma and Agarwal
Heliothis, Earias
oviposition preference.
(1983b); Navasero
and Ramaswamy
(1991); Butter and
Singh (1996)
Cotton jassid, Amrasca Hairy varieties are resistant to jassid Sharma and Agarwal
biguttula biguttula
damage.
(1983a)
White fl y, Bemisia tabaci Hairy varieties are susceptible to
white fl y.
Navon et al. (1991)
Pigeonpea Pod borer, Helicoverpa armigera Nonglandular trichomes associated Romeis, Shanower,
with resistance.
and Peter (1999)
Chickpea Pod borer, Helicoverpa armigera Glandular trichomes contribute to Yoshida, Cowgill, and
pod borer resistance.
Wightman (1997)
Cowpea Pod borer, Maruca vitrata Trichomes inhibit feeding by the Jackai and Oghiakhe
neonate larvae.
(1989)
Pod sucking bug, Clavigralla Nonglandular trichomes impart Chiang and Singh
tomentosicollis
resistance.
(1988)
Soybean Cabbage looper, Trichoplusia ni Trichomes inhibit feeding by the Khan, Ward, and
neonate larvae.
Norris (1986)
Stem fl ies, Melanagromyza, Nonglandular trichomes impart Chiang and Norris
Ophiomyia
resistance.
(1983)
Alfalfa Alfalfa aphid, Therioaphis Nonglandular trichomes impart Manglitz and Kehr
maculata (Buckton)
resistance.
(1984)
Tomato Fruitworm, Helicoverpa Glandular trichomes associated with Farrar and Kennedy
armigera
resistance.
(1987)
Leaf pubescence associated with
oviposition preference.
AVRDC (1987)
Brinjal Fruit borer, Leucinodes orbonalis Nonglandular trichomes impart R.N. Panda and Das
(Guen.)
resistance.
(1974)
Okra Leafhopper, Amrasca biguttula Nonglandular trichomes impart R. Singh and Agarwal
biguttula
resistance.
(1988)
Bittergourd Melon fruit fl y, Bactrocera Flesh thickness and fruit diameter Dhillon et al. (2005b)
cucurbitae
are associated with susceptibility
to fruit fl y.
colony size and pattern of insect distribution. Shaking the plants, use of sampling nets, use
of traps, or actual counts are used to obtain an estimate of insect numbers per plot or plant.
Insect populations can also be sampled for host preference or antixenosis by counting the
insects that settle on a host plant for oviposition, for example, numbers of head bugs or
midge females on sorghum panicles at the panicle emergence and fl owering stages, respectively
(Sharma et al., 1992). Counting the numbers of eggs laid on different genotypes can
also be used as a measure of host plant preference by the adults. Population build up can
be measured at an appropriate stage as a measure of antixenosis and antibiosis or host
suitability for the insects. Numbers of insects entering in diapause at the end of the cropping
season, such as diapausing larvae of cereal stem borers and pupae of Heliothis/
Helicoverpa, can also be used a criterion to measure host plant resistance to insects.