High Yielding Rice Cultivars, High Rainfall and High Humidity Favour Nymphula depunctalis (Lepidoptera: Pyralidae) to Reach Major Pest Status: A Study in Dhemaji District, Assam

2013 ◽  
Vol 36 (5) ◽  
pp. 469-475
Author(s):  
Hiren Gogoi ◽  
Dipsikha Bora
Keyword(s):  
High Humidity ◽  
Rice Cultivars ◽  
High Rainfall ◽  
Pest Status ◽  
Nymphula Depunctalis ◽  
Lepidoptera Pyralidae ◽  
Major Pest

scholarly journals A Generalist Feeding on Brassicaceae: It Does Not Get Any Better with Selection

Plants ◽  
2021 ◽  
Vol 10 (5) ◽  
pp. 954
Author(s):  
Jacinta M. Zalucki ◽  
David G. Heckel ◽  
Peng Wang ◽  
Suyog Kuwar ◽  
Daniel G. Vassão ◽  
...  
Keyword(s):  
Growth Rate ◽  
Artificial Diet ◽  
Larval Growth ◽  
Insect Herbivores ◽  
Improve Performance ◽  
Pest Status ◽  
Larval Growth Rate ◽  
Major Pest ◽  
Generalist Insect ◽  
Rate Development

Brassicaceae (Cruciferae) are ostensibly defended in part against generalist insect herbivores by toxic isothiocyanates formed when protoxic glucosinolates are hydrolysed. Based on an analysis of published host records, feeding on Brassicas is widespread by both specialist and generalists in the Lepidoptera. The polyphagous noctuid moth Helicoverpa armigera is recorded as a pest on some Brassicas and we attempted to improve performance by artificial selection to, in part, determine if this contributes to pest status. Assays on cabbage and kale versus an artificial diet showed no difference in larval growth rate, development times and pupal weights between the parental and the selected strain after 2, 21 and 29 rounds of selection, nor in behaviour assays after 50 generations. There were large differences between the two Brassicas: performance was better on kale than cabbage, although both were comparable to records for other crop hosts, on which the species is a major pest. We discuss what determines “pest” status.

Animal production and improvement in Malaya

1967 ◽  
Vol 5 (4) ◽  
pp. 167-171
Author(s):  
C. Devendra
Keyword(s):  
High Temperatures ◽  
Oil Palm ◽  
Animal Production ◽  
High Humidity ◽  
High Rainfall ◽  
Increasing Demand

The high humidity, high rainfall and moderately, but consistently, high temperatures encountered in Malaya set severe problems for the improvement of animal production, particularly when upgrading by the introduction of European breeds, As might be expected, progress is being stimulated by the increasing demand for protein. It may also be accelerated by current efforts to develop a more diversified agriculture, if only from intensified “undergrazing” of the expanding acreage under oil-palm and coconut.

Natural Enemies of the Rice Caseworm Nymphula Depunctalis (Guenée) (Lepidoptera: Pyralidae)

1994 ◽  
Vol 15 (03) ◽  
pp. 261-268
Author(s):  
James A. Litsinger ◽  
Narong Chantaraprapha ◽  
Alberto T. Barrion ◽  
Jovito P. Bandong
Keyword(s):  
Natural Enemies ◽  
Nymphula Depunctalis ◽  
Lepidoptera Pyralidae

scholarly journals Tanaostigmodes cajaninae LaSalle sp. n. (Hymenoptera: Tanaostigmatidae), a potential pest of pigeon pea in India

1985 ◽  
Vol 75 (2) ◽  
pp. 305-314 ◽  
Author(s):  
S. S. Lateef ◽  
W. Reed ◽  
J. LaSalle
Keyword(s):  
Cajanus Cajan ◽  
Andhra Pradesh ◽  
Pigeon Pea ◽  
Control Measures ◽  
Pest Status ◽  
Potential Pest ◽  
Major Pest ◽  
And Control ◽  
Wild Hosts

AbstractTanaostigmodes cajaninae LaSalle sp. n., the larvae of which feed in pods of pigeon pea (Cajanus cajan), is described. This insect, which also feeds on the weeds Atylosia spp. and Rhynchosia spp., has reached pest status on ICRISAT's research farm in Andhra Pradesh, India, where more than half of the pods on the late-maturing pigeon pea crops may be infested. However, surveys of the crops in farmers' fields in India showed that, although this insect is widespread, it is not yet a serious pest. The abnormal populations of this insect on the ICRISAT research farm appear to be associated with an abundance of its wild hosts, the availability of pigeon pea pods for many months in each year and the use of endosulfan, which does not control the pest but reduces its parasites. The potential for T. cajaninae to become a major pest in farmers' fields is discussed, and control measures are suggested.

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