Mukhtar Ahmad , M. D. Jamal Ahmad , R. K. Mishra , H. R. Khan

Abstract

Trichogramma species so far recorded from India include T. acheae, T. agriae, T. australicum, T. brevifringiata, T. chilonis, T. chilotraeae, T. embryophagum, T. flandersi, T. hesperidis, T. japonicum, T. minutum, T. pallidiventris, T. plasseyensis, T. poliae, T. pretiosum, T. raoi and T. semblidis. These were recorded from different States including Andhra Pradesh, Bihar, Gujarat, Himachal Pradesh, Jammu and Kashmir, Karnataka, Orissa, Punjab, West Bengal, Uttar Pradesh and Uttaranchal parasitising upon variety of insect pests of forestry, agriculture, and vegetable crops.

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Shujauddin , H. R. Khan

Abstract

Poplars are targets of more than 100 insect pest species belonging to various groups. Out of these, 58 species are foliage feeders (defoliators). In fact, not all attain epidemic proportion. During the present studies, the insect species Leucoptera sphenograpta Mey, a lepidopterous insect belonging to family Lyonetiidae, is found to be infesti:ug Poplar and is a new record responsible for premature leaf shedding. The present paper deals with the biology of the pest studied in detail, covering the observations recorded on nature, extent of damage, immature stages and their duration, seasonal life cycle of the pest. The insect completes 10 to 12 generations in a year. The insect is a regular pest of Dalbergia sissoo mining the leaves but it has shifted its food and feeding behaviours, now has become a serious pest of Poplar. It also appears in outbreak causing significant damage to Poplars. The management of the pest includes chemical and non-chemical methods. Foliar spraying of Fenitrothion 50 EC at the rate of 0.05 per cent or Carbaryl 50 WP at the rate of 0.2 per cent water emulsion spray is effective to check the damage at small scale. Among natural enemies, four larval parasites, two pupal parasites, one egg parasite were recorded effective as biocontrol agents helpful in minimising the pest population in the field.

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K. C. Joshi , H. R. Khan

Abstract

Tbe giant red bug, Lohita grandis Gray is a pest of Trewia nudiflora, Bombax ceiba, Gossypium herbaceum etc in the warm humid forest areas of North-east India. The female develops quicker than male.There are four overlapping generations of the pest. The chemical control experiments were conducted to test the relative toxicity of insecticides so as to check the damage in young plantation. Hence ten modern insecticides i. e., Carbaryl, Dursban, Dichlorvos,Dimethoate, DDT, Endosulfan, Fenitrothion, Monocrotophos. M-parathion and Chloropyriphos were tested. The result showed that Carbaryl is the most effective and 39 15 times more toxic than DDT. The insecticide next to Carbaryl in toxicity waS found Chloropyriphos.

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Sushil Kumar , Lalji Prasad , H. R. Khan

Abstract

Biology of tendu defoliator Hypocala rostrata was studied. Larvae started to appear in the month of April and highest population was recorded in the month of October, 1985. In July and August average larval period of 18 ± 1.41 days was recorded. Pupal period varied from 6.17 ± 0.41 to 15.89 ± 4.43 days in April and November. Respectively. Nuvan and Monocrotophos in EC formulations were found effective to control the 3rd stage larvae.

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H. R. Khan , Sushil Kumar , Lalji Prasad

Abstract

Seasonal activity and abundance of insect pest species (15 Insect species) i.e. defoliators, borers and sap suckers of agro-forestry importance were studied for two years during 1983 to 1985. Variation in adult population during different months, peak period of activity, infestation, fluctuation in population level on the basis of light trap catches were recorded. The meteorological data of the study area (KV AK, Jabalpur) was maintained. Light trap device was found helpful predictng the active insect species in study area, the infestation time and level. The technique is found effective in forest pest management having no adverse effect on environment.

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Sushil Kumar , H. R. Khan , Lalji Prasad

Abstract

Swarming, Sex ratio, sexual dimorphism, weight and moisture content in M. unicolor have been discussed. Swarming was recorded in between 7.30 pm. to 9.00 p.m. in the month of June. Sex ratio for all colonies statistically deviated from
50:50 ratio at 0.1% level of probabillty. Sexual dimorphism was found significantly differ in regards of total body length and maximum width of abdomen. Females were distinctly heavier than males in wet and dry weight and loss of moisture. In percentage of moisture content in body, females are somewhat heavier than males.

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H. R. Khan , R. S. Bhandari , Lalji Prasad , Sushil Kumar

Abstract

Teak defoliator Hyblaea puera and skeletonizer Eutectoria machaeralis are serious. Insect pests of teak in IndIa which cause severe damage to green foliage durina growth period of the trees. The seasonal abundance and fluctuation in pests population associated with the incidence of attack, was studied at three location in Barela Rance, Mandla Forest Division (Madhya Pradesh, India) during 1982 to 1986. The results of five years data on population dynamics are discussed in relation to pest status of defoliator and skeletonizer. The major active period of H. puera was July and August while least active period was observed from September onwards. Generally, the pest complete 2 to 3 overlapping generatiOns during its active period. In E. machaeralis, the highest population was recorded during September. It complete 4-5 overlapping generation during its active period from August to October.

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H. R. Khan , Lalji Prasad , Sushil Kumar

Abstract

Defoliation of Sterculia urens (Kullu) trees by Oglasa separata Walker was recorded in Madbya Pradesh. Biology of defoliator was studied. the insect completes its life cycle from 43 to 60 days during July and August. Larval and pupal period was recorded 20 to 25 and 10 to 15 days respectively.

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